Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44934c3c93e1b2f…

MALICIOUS

PDF

65.8 KB Created: 2021-01-20 10:52:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4e49c9980c4db7d5e91292d5b0b891f0 SHA-1: 717a994d615636b58d3cecd1d3861522880f1d7f SHA-256: e44934c3c93e1b2fef8240eff171feb10aa96e90d9a49628a900a282b3df5d0e
126 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, references 'lucky patcher for online games', a common lure for distributing cracked software or malware. The presence of multiple PDF-specific heuristics related to URI embedding and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafffi.ru/123?utm_term=how+to+use+lucky+patcher+for+online+games PDF link annotation
    • https://cdn.sqhk.co/mawedabe/hijhbYU/30709571107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_5fdbde30206bc.pdfIn PDF document text
    • https://pakipetunora.weebly.com/uploads/1/3/4/8/134881281/3948435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445333/normal_5fea1130028a8.pdfIn PDF document text
    • http://fepotarugagi.22web.org/39488181814.pdfIn PDF document text
    • https://vagofavom.weebly.com/uploads/1/3/4/4/134486407/balezikojoreze-sujeberozon-xexerituxesexe-vawepadasizife.pdfIn PDF document text
    • https://totimukax.weebly.com/uploads/1/3/0/7/130739837/wokomepanikezim.pdfIn PDF document text
    • https://site-1168462.mozfiles.com/files/1168462/christian_reformed_church_palm_springs.pdfIn PDF document text
    • https://dojoxokixen.weebly.com/uploads/1/3/4/8/134878929/3477924.pdfIn PDF document text
    • http://jofufuzutaki.22web.org/lapomuzekaxom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f896816353d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489717/normal_60078e38b91ed.pdfIn PDF document text
    • https://degexaxi.weebly.com/uploads/1/3/1/4/131406510/komajazelubixemokora.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/ihibAgg/the_wonder_weeks_app_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozawexopad.epizy.com/kofomalotu.pdfIn PDF document text
    • http://mujozitovisiwud.rf.gd/davikamomos.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 5648 bytes
SHA-256: 468b1d8e9eec8a73d1b1fee19db9114c562684c553defe46bf06363f1fefd6bd
font_01_sfnt_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 10116 bytes
SHA-256: f13e36e63bf0d4d997fc0b85fce455145f2df52392a2a878bc5a29a92c869b95

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