Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8e77d2b32a3680…

MALICIOUS

PDF

88.6 KB Created: 2020-12-17 21:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f9dd3706d8d796701403a58f7baf520d SHA-1: 0b0b37eff9b51dc84a0993493954d52a963cc93d SHA-256: ba8e77d2b32a36801a56fef66455ba6b979adb9526b187541881b364eba79f81
134 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, indicating it functions as a link farm. The primary malicious URL identified is https://trafffe.ru/strik?utm_term=lego+las+vegas+light+kit, which likely serves as a lure for phishing or malware distribution. No scripts were extracted, but the PDF structure and URI findings strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffe.ru/strik?utm_term=lego+las+vegas+light+kit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480182/normal_5fac605f98ba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_5fb85dd90ac54.pdfIn PDF document text
    • https://fisupipegapug.weebly.com/uploads/1/3/4/5/134515512/kegunarunude.pdfIn PDF document text
    • https://fijakesu.weebly.com/uploads/1/3/4/5/134527503/zapasujetetim_xajomegeposob_livebevamawol.pdfIn PDF document text
    • https://fofulusi.weebly.com/uploads/1/3/4/7/134774969/7666730.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/4005484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5f962f26bf92f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489409/normal_5fc3633f9bc0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5fa7edc655b38.pdfIn PDF document text
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/buwanetifivoje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/14654891022.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/teamwork_and_leadership_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/35499569639.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/gelidusilavutivorugive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005598c7-d158-4059-b124-ae286439541f/ut_quest_homework_answers_stoichiometry.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 4600 bytes
SHA-256: f911c898859990d26fdabed8c01d4d6b091027a259b21de375ef3e7be3bd8a07
font_01_sfnt_off000120b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 11180 bytes
SHA-256: e9dc04fa7b67d535fddb6c2c13aa3b9d2fcf8370781dfa5566a2df08f8c91704
font_02_sfnt_off000146ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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