Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c3e71d3eb5d8dd…

MALICIOUS

PDF

115.5 KB Created: 2021-06-11 06:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2eebed32f6225a37cdb94322361ca714 SHA-1: dbc95ef67f42ba0c4848040ea71696bcc3640e3b SHA-256: e6c3e71d3eb5d8dde3a581cc11ca3ee07d5e42639f8b60f399d0b8917788fca1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/pbw?utm_term=bsc+3rd+year+zoology+practical+book+pdf PDF link annotation
    • https://kojezuduw.weebly.com/uploads/1/3/5/3/135326104/fezimosobapi.pdfIn PDF document text
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/5488384.pdfIn PDF document text
    • https://vimujagu.weebly.com/uploads/1/3/4/3/134306096/7534990.pdfIn PDF document text
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/6355875.pdfIn PDF document text
    • https://zebidomixivo.weebly.com/uploads/1/3/4/3/134326720/8610818.pdfIn PDF document text
    • https://novesorolawo.weebly.com/uploads/1/3/4/8/134886892/jiket-kexarosofuz-mexadidonuz-sagir.pdfIn PDF document text
    • https://tumonejaw.weebly.com/uploads/1/3/6/0/136086042/mugefi_tomazik_wafik.pdfIn PDF document text
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/5797789.pdfIn PDF document text
    • https://telutifezidawu.weebly.com/uploads/1/3/4/6/134624569/5054153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b25d21-51cf-4d37-8269-ecbc25583aed/xaxebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd899af-6f4e-4111-abba-d0ce0940239a/fisher__paykel_dishwasher_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9134f23-0d77-4468-8e1e-0c10a46b9183/xuxawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a51426d1-5a4d-40be-9536-0e7fab9d93a3/libro_de_espaol_3_de_secundaria_2020_trillas_humberto_cueva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11093f47-07a0-4766-bc38-a4cf970a7c43/43981457624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c74076c-e80d-4ab9-972c-331239db1154/irregular_verbs_worksheets_for_third_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ceab86b-6fd9-4bd3-a19b-cc9fd097135c/36711657470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b76e67-a1ac-45c8-bb29-83ee78d61996/when_did_get_tough_on_crime_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff39fec6-b234-457a-a300-ef80867ae846/lonikulefekalavodumipabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea5658c-9f7a-4400-abbb-d8eceb4cda18/how_to_use_ezdrummer_2_in_fl_studio.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 3588 bytes
SHA-256: b800b0154cf4609eb52ecb88c1d62bcb1520f9ed447c89fb2d623d1b4f3e88ce
font_01_sfnt_off00013de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 5572 bytes
SHA-256: 517fa511b4bf91ed4a99e197473062769a06f458d63cc898019474787ee4fc39
font_02_sfnt_off000150f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F3 5672 bytes
SHA-256: b8b9833d00acbbba4f10cb65ed9772d9689f64607bef7b6513fe64eef99df5eb
font_03_sfnt_off00015f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F03 12676 bytes
SHA-256: 4e06a4c7af65e000bde015989a89d10f638d18cd71c9f5e25aa3a6064af42f6a
font_04_sfnt_off00018893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18893 16196 bytes
SHA-256: 34a6609f4ed3d372563b975eb83429e946e3eaab765dcf8f9c0f0cfad3662128
font_05_sfnt_off00019de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_06_sfnt_off0001abe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABE4 4900 bytes
SHA-256: 69b95d463fa001fd6a91b231b3f5b47067cc68c6df03b46037956d7e44bb5c0c

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