Malicious PDF — malware analysis report

Static analysis result for SHA-256 616b13d831b45931…

MALICIOUS

PDF

99.6 KB Created: 2020-11-14 07:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e6ed2339e6fc7a9801f3168673c60c08 SHA-1: b8db620000a1953db882a6e7ab344e24078189d3 SHA-256: 616b13d831b459312e1e284cbf6875b23c77dc00455da02e32fbab6de9dfcc5b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many pointing to disposable hosting services like Weebly, and one specifically to a known malicious redirector. This behavior is indicative of a link farm designed to manipulate search engine rankings or to distribute further malicious payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/aws?utm_term=cambodia+flag+emoji+android In PDF document text
    • https://moxoviwepikiwu.weebly.com/uploads/1/3/2/8/132814726/kedakikozadasiniget.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/5650186.pdfIn PDF document text
    • https://sukevimekixav.weebly.com/uploads/1/3/4/5/134599702/d6d4d5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_5f9d38b44b7c9.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/lezusimenijex_foxuxasewolusat_sikubuw.pdfIn PDF document text
    • https://nofexozodaxo.weebly.com/uploads/1/3/4/5/134522082/zipezikisivazule.pdfIn PDF document text
    • https://fetibafavi.weebly.com/uploads/1/3/0/7/130776688/gagegu_wufigoxudekun_puzataguxe.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/bb427ecff126227.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0f069c-4dad-4053-8252-e54dbb1d1100/arcore_android_example_github.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc9e855-8881-4e89-a6be-a9a7ebec64e4/31021109257.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/91214923554.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/15499297103.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 6812 bytes
SHA-256: ebfc6ae9101a580b251f18edb4f130d6b8a0a69f7e0152a464433f4f38f834d3
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 2956 bytes
SHA-256: bfd57f5a7e09f0e89b51dfd8f9a1b73e9344ddc3101e8db295d4bc622a77b825
font_02_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 5172 bytes
SHA-256: 5118f711eede3fcb56b8e81f6bf5f495c0c7de4717565b68e580d8fe905494f8
font_03_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 4492 bytes
SHA-256: e51ec02127721fccb15b8d61d62d20da9277b9eacd9664a69f59b4184cda3749
font_04_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 15664 bytes
SHA-256: 51346612505fa9d2a1509ca855404b2c124c76554724da137d0428b512de9d77
font_05_sfnt_off00013807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13807 11408 bytes
SHA-256: d85a6b2177a4a68c7200e2ac623d063db2a10fc5bab29dbc3869cdd7397d039e
font_06_sfnt_off00015ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ED5 16808 bytes
SHA-256: 6bb50fa8b68a42866b7e74a8f5ac27f8fab51420113389849ddd37e933faed74
font_07_sfnt_off00017677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17677 1736 bytes
SHA-256: 551918360585b1590efa6fd2a215345b2f702067d151a0e4b48cfa7490b57960

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