Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6177fe4f3a3cc9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-29 04:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa1b25842ef5e7358334fbd0e937f46b SHA-1: 9875b9f3ce9f1b7b198998dcc12284b9baeabe2a SHA-256: 3a6177fe4f3a3cc97b33b3ac6ca88d4f980fe6044c21169c70200405594549f3
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('zajinet.ru') that is likely part of a link farm designed to redirect users to malicious content. The document body, though heavily garbled, contains keywords related to downloads, reinforcing the lure. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9775

Heuristics 5

  • 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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://zajinet.ru/award?keyword=apache+poi+tutorial+pdf+download
    • http://wijofotezopadik.medianewsonline.com/buwaranipafuzikakibako.pdf
    • https://fanejutasoja.weebly.com/uploads/1/3/5/3/135399707/lafan.pdf
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/kisudetotiru.pdf
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/xufuxodejo.pdf
    • http://zagunur.22web.org/the_accused_movie_480p.pdf
    • http://ruwufuwetoj.mygamesonline.org/xivekilikunot.pdf
    • http://dexaputanit.mygamesonline.org/chinese_language_learning.pdf
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/xaxakofigedafil.pdf
    • http://fotubobuwenapu.scienceontheweb.net/83214740843.pdf
    • http://tiwimifozukimu.medianewsonline.com/botany_2nd_year_notes.pdf
    • http://fudoviwil.mywebcommunity.org/3622320476.pdf
    • http://sitajejo.22web.org/as_3500._2.pdf
    • http://tamakedesununod.mywebcommunity.org/84055920715.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ranixivakogabon.epizy.com/30425607233.pdf
    • http://nagomekivi.epizy.com/modular_origami_star_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/349f3927-68ca-4178-9b80-d3a83f51193c/zojedibum.pdf
    • https://uploads.strikinglycdn.com/files/0e4c9b9b-61f4-45d3-9fbc-90762adfe10e/75337505337.pdf
    • https://uploads.strikinglycdn.com/files/99e9acb5-540d-4c45-a874-ef8e6095f762/the_philosophy_of_andy_warhol_book.pdf
    • http://nogomazarem.epizy.com/kajosufetarasojanegavubev.pdf
    • http://tujefozumuresul.epizy.com/19702228860.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f704.bin
aadaa64ffc22a8b3c5dcfc1dadb72d79452f1c942d677ead1c0c4f22f108bb2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 5144 bytes
font_01_sfnt_off00010891.bin
d331ff42ce0a9d5581967f2829e4c30b36203fb52396cc2b9a7dc74d48165145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 11100 bytes

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