Malicious PDF — malware analysis report

Static analysis result for SHA-256 0606c5f8c6f54035…

MALICIOUS

PDF

74.5 KB Created: 2021-04-05 15:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8cc888784c25fa9049a5ecb4a9a21d2f SHA-1: 597c87dfc677f619125f74754857fe16d9c6f892 SHA-256: 0606c5f8c6f540352c2e9726f1f25721b97472fddf3f689f5ae2a2baf7009e12
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to contain search terms related to educational institutions, likely a pretext to disguise the malicious links.

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://vilenefex.ru/strik?utm_term=aircraft+maintenance+engineering+colleges+near+me PDF link annotation
    • http://vatemuredaxusob.22web.org/tugatuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_6062334b42ba4.pdfIn PDF document text
    • https://fewugoxozo.weebly.com/uploads/1/3/4/4/134441687/gosab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489844/normal_602b08eab2da6.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/saronodotizarovivut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466379/normal_5fef7bb7060f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458614/normal_600e98d72edd2.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/ijchcGD/python_3._7._2_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/evjgjd7/28485787610.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a8564f-ea53-4ea7-ae50-210d8dc42246/rulonixesavaxixiwipi.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/exponents_worksheets_grade_6th.pdfIn PDF document text
    • http://komadolosa.rf.gd/vezexox.pdfIn PDF document text
    • http://sedufutubuge.epizy.com/tefizisopef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c5ee26-3d20-4929-aa66-405cd0a7b324/kimetokaxopetosuvitikon.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/aha_acls_manual.pdfIn PDF document text
    • http://kilizamigikulut.epizy.com/interview_questions_and_answers_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501f15cd-cf09-49e6-a10e-a45eee2f5c90/71276731417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba03e403-81bb-409b-8533-8ee892d52396/a6400_vs_a6500_camera_decision.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/what_happened_in_the_pit_and_the_pendulum.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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 5192 bytes
SHA-256: 7d2b3370b60afdfdee5598f91b5e287df03cf92c7ea5f05073efbde5cddd0e84
font_01_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 10476 bytes
SHA-256: e9292a1786778fc767e7852ff41f313896b50b7a4b5f487cdf13813375a3e7b2

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