Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe948eb2ee2b2f7…

MALICIOUS

PDF

73.4 KB Created: 2021-06-11 13:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 204d42e34e49e88d714e4da04a36e0f5 SHA-1: af27b31f1fdcbc5b0ade4a1fe086eb1c0f799f72 SHA-256: 7fe948eb2ee2b2f7ba6e6ca76d02a725c738925e15852db53f0ec60c6277401a
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/pbw?utm_term=past+perfect+continuous+tense+worksheet
    • https://cdn-cms.f-static.net/uploads/4415740/normal_60c07fd85db2f.pdf
    • https://putifunefam.weebly.com/uploads/1/3/0/7/130775131/wizonikegogali.pdf
    • https://static.s123-cdn-static.com/uploads/4471682/normal_5ff0a64cb874f.pdf
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5fde71c22b2cb.pdf
    • https://cdn-cms.f-static.net/uploads/4499329/normal_603d7c0d7e3c0.pdf
    • https://wasoxojeroxinab.weebly.com/uploads/1/3/4/8/134888233/dc563.pdf
    • https://cdn-cms.f-static.net/uploads/4372963/normal_60b9c7503809e.pdf
    • https://cdn-cms.f-static.net/uploads/4479904/normal_6010a08c96b33.pdf
    • https://bowodazuludov.weebly.com/uploads/1/3/4/7/134700376/tepidifexip.pdf
    • https://lurovexizapup.weebly.com/uploads/1/3/4/4/134402553/vilas-ritakeduwivoj-jigudunepab-lopujuxakuziwe.pdf
    • https://tupakebu.weebly.com/uploads/1/3/5/3/135308645/rojikovus.pdf
    • https://vozirelekoru.weebly.com/uploads/1/3/4/5/134594553/5889430.pdf
    • https://cdn-cms.f-static.net/uploads/4471683/normal_5fe90a7301679.pdf
    • https://kinifuromokemo.weebly.com/uploads/1/3/5/3/135348191/tixelewubixozi.pdf
    • https://cdn-cms.f-static.net/uploads/4383679/normal_60c0ef2825f4d.pdf
    • https://static.s123-cdn-static.com/uploads/4485689/normal_6000127ebb55e.pdf
    • https://wovuxekas.weebly.com/uploads/1/3/4/3/134379471/kozopexuvujiku-xiduluz-zototavali-jusodukotewek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lekuzax.pbworks.com/w/file/fetch/144412215/adobe_photoshop_classroom_in_a_book_2021_release_download.pdf
    • http://detomipipu.pbworks.com/f/69304195900.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e035.bin
c051f3ebca0f9dd5256497873d364b4a1e5a4e098d7c00b410d939c24b83cd55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 5228 bytes
font_01_sfnt_off0000f20f.bin
a47c59e33554ea06c1ad21041c1853438ca3f0e0588134dacc76abf494310a27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 10708 bytes

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