Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a2ef1151c753f3…

MALICIOUS

PDF

74.8 KB Created: 2021-03-08 22:49:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 51ab76023b94bbdfbc21aa8c5d5206e2 SHA-1: 8939ca91db15a95dbf7c84a0ba69d0f8a79338bd SHA-256: b7a2ef1151c753f3a128ca019027c47f4f058595445cb5d7c4770481e780673c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded URLs points towards an attempt to redirect users to malicious or spam content.

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
  • 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://druttle.ru/wix?keyword=rise+of+totalitarianism+worksheet PDF link annotation
    • https://naratejog.weebly.com/uploads/1/3/2/6/132682615/78e197ed6.pdfIn PDF document text
    • https://tinabatof.weebly.com/uploads/1/3/0/7/130776088/4127210.pdfIn PDF document text
    • http://rezltml.xyz/76043173935kx8n9.pdfIn PDF document text
    • https://zebazefapik.weebly.com/uploads/1/3/1/3/131383848/fbb48b26fd4fe67.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/d61652dc64adc86.pdfIn PDF document text
    • https://babibogek.weebly.com/uploads/1/3/1/3/131379554/dufipiruzipamugapeb.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/055utcC/67929002414.pdfIn PDF document text
    • https://solunezowalini.weebly.com/uploads/1/3/4/6/134625762/bb46cf4ac8.pdfIn PDF document text
    • https://tuwopabawebude.weebly.com/uploads/1/3/1/3/131382790/risudor_joled_jemizawel_jalamapivunax.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/c9d45cedbf6.pdfIn PDF document text
    • https://cdn.sqhk.co/kutogudofi/aoWgdhg/85117635190.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/xofoxugejedeke.pdfIn PDF document text
    • https://cdn.sqhk.co/xenekifa/iu1igum/emergency_motel_vouchers_online.pdfIn PDF document text
    • https://babiweperes.weebly.com/uploads/1/3/5/3/135347107/3720136.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/jgdidhd/vogosizajaxoluxizuvujisa.pdfIn PDF document text
    • http://excschool.ru/rivixefuziparxgoyn.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/cd09166a-0f07-4a49-9759-02bf4a4c644d/is_it_bad_to_marry_your_2nd_cousin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96fb1c9-4ea9-40b1-8685-094c2669bb2a/xakedifuzutupuxojasuxav.pdfIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_2fe57f5db12a4dcf8c776afa1590cdb1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0044b610-0ca1-4100-b3b6-d205a1d1fabf/the_complete_far_side_paperback.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_ba0acd3fa80d4bfd86b9c413142dc6aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d23d25-21ac-4306-aca6-9a7df1c4eeee/escriba_una_definicin_propia_del_aprendizaje_basado_en_proyectos_abc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c55ff26-7364-48c4-8872-fc71f3231873/jawuwovazizonazogef.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_5e6c45a1f4dc4ab39fca646ff3373b15.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_0885166a5fe64af4b9a862846623f672.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 5168 bytes
SHA-256: 1c06366e52872b0a20dff8a82a8b1ca29299e51188e96849a51e22fd98784695
font_01_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 10700 bytes
SHA-256: 1fda62476805440e38bfafc1b781794fbcf82f58faf16da7854b9a9eb9b82402

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