Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fff5292b2cbab7…

MALICIOUS

PDF

78.6 KB Created: 2021-05-07 22:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8826daefe8ea7661de44d33832594e89 SHA-1: a94063661eedb4350f2b666662fa95ae46e24544 SHA-256: c5fff5292b2cbab7ae8d80ca7f14bbe39a0d26e774e4199ee3a2cdc8b81c239e
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 an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://zajinet.ru/strik?utm_term=2.9+gpa+equal+to+percentage', is particularly suspicious. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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://zajinet.ru/strik?utm_term=2.9+gpa+equal+to+percentage
    • http://xuvalikamug.22web.org/define_breather_in_transformer.pdf
    • http://nudivupekol.22web.org/i_am_joaquin_poem_citation.pdf
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/kafazatum_majuda.pdf
    • https://rukadewij.weebly.com/uploads/1/3/4/0/134012321/winedebadutasipukimo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gupawupigawono/56980331938.pdf
    • http://jolavewavesuj.epizy.com/android_charles_ssl.pdf
    • http://disejeninajexak.rf.gd/87525866033.pdf
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_61181688298a4e8fbf4be106f821c02f.pdf?index=true
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_365dc26419e0426080f0d05bada9fbb2.pdf?index=true
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_f5222d39a7e448d292d6054a8f4f923c.pdf?index=true
    • https://s3.amazonaws.com/fujadabez/68048426128.pdf
    • https://s3.amazonaws.com/supefujoxopubu/how_to_fix_a_squeaky_whirlpool_cabrio_dryer.pdf
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_7041266006e84fbd92aa4958e90bb63a.pdf?index=true
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_1b3ae88eae8145fbb536fd157c94bc7d.pdf?index=true
    • http://jojudodadanu.epizy.com/free_nra_range_bag_review.pdf
    • http://dukodisedibuji.epizy.com/captopril_25_bula.pdf
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_c28968b4ab9044b9aafd4c61e8b471ac.pdf?index=true
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_36f7a786002e4ab0b5ff16ef34a4836c.pdf?index=true
    • http://zuvemodu.rf.gd/california_rental_application_form.pdf
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_5334e48621d84c709c85195e93a22839.pdf?index=true
    • 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_off0000f40c.bin
a89fa34a2ca6250c9cee2d4120ffa1f7c2d8a32a77d7125d97190ea1681e73fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 5272 bytes
font_01_sfnt_off00010618.bin
dda2f37cca350c74e82f796580a2e2ca09080379d788709b4253a977bfa8f587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 11604 bytes

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