Malicious PDF — malware analysis report

Static analysis result for SHA-256 66022a13afde6c1d…

MALICIOUS

PDF

76.4 KB Created: 2021-01-18 18:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b8a8a3b4c18a3ec4a0a3830f2eec9f39 SHA-1: 441a8e158becc45f2f57965286529c960f4777a5 SHA-256: 66022a13afde6c1df07f58bbc4eb7fb7c1f72aa3f0ea0a630b99332541d9fe2e
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. The document's structure and embedded links suggest it is part of a link farm designed to distribute malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://yafferge.ru/aws?utm_term=suddenly+seymour+sheet+music+pdf In PDF document text
    • https://site-1249465.mozfiles.com/files/1249465/arrays_in_c_programming_examples.pdfIn PDF document text
    • https://kaxorude.weebly.com/uploads/1/3/4/0/134095875/robogapuvapitab-mafosegem.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/23a0c7580a1aa.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/sarisare.pdfIn PDF document text
    • https://site-1211548.mozfiles.com/files/1211548/14959122648.pdfIn PDF document text
    • https://site-1172884.mozfiles.com/files/1172884/seagull_bartender_7__75_free.pdfIn PDF document text
    • https://lijujizakivim.weebly.com/uploads/1/3/4/6/134634855/d34b8d6571fae.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/5tHvWtt/41777295676.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/bemapepugu.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/eg611Gk/moto_rider_go_highway_traffic_game.pdfIn PDF document text
    • https://site-1176004.mozfiles.com/files/1176004/wezitagivajuduropa.pdfIn PDF document text
    • https://begumilipanup.weebly.com/uploads/1/3/4/6/134617951/4354143.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/Mq8jeBa/atom._io_light_themes.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/bekotufalefufex_mogozuvenozerum_gamot.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/iajfdFG/vazarebomolivaxubuwubuf.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/ecqlggq/92788711361.pdfIn PDF document text
    • https://site-1194081.mozfiles.com/files/1194081/rubikufogatapajavitupaper.pdfIn PDF document text
    • https://site-1209810.mozfiles.com/files/1209810/tovugonoturuzapu.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/godajuva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nosifunugiwes.epizy.com/email_format_english_grammar.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/83731764787.pdfIn PDF document text
    • http://dovobol.epizy.com/browser_for_android_phone_best.pdfIn PDF document text
    • http://tikarere.epizy.com/job_description_personal_assistant_template.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 5272 bytes
SHA-256: 971ca343966342acfbb875ce5ed59305af9387cf8b5182a05e51b9072dd8381d
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 10220 bytes
SHA-256: 758971960da976ea64cc169f6249dcdf8f3642851a58e3bd48d5072a58b8d53e
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333