Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bff045d22b1214…

MALICIOUS

PDF

79.7 KB Created: 2021-03-30 04:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b060eb28cc449a0e0b85955ace12604 SHA-1: 1553eabd467ac4405ed8a097d0b74f0fd4dc4306 SHA-256: 84bff045d22b1214ab6a579e72e64a8af45ad99d7a9dc70da8b0aac06800008f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search results or redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs are likely part of this link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://botokaw.ru/award?keyword=social+psychological+theory+pdf
    • https://cdn.sqhk.co/lufelumad/iaidijE/adaptive_card_fallback.pdf
    • https://cdn.sqhk.co/widobixi/cjeDPtP/dedotisitepolapikatizi.pdf
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/7815958.pdf
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5fe297241eeca.pdf
    • https://xidoteruredogon.weebly.com/uploads/1/3/1/4/131454367/a37f9.pdf
    • https://sorajofuwomukiz.weebly.com/uploads/1/3/1/4/131407138/papulatevevabe-tumuxugolexaji-bugozope.pdf
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/9871003.pdf
    • https://cdn.sqhk.co/relulapezele/bMOhijh/diriraboxepupukolo.pdf
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/1764426.pdf
    • https://jixofivibup.weebly.com/uploads/1/3/4/6/134682426/lizokawaziwid-limiwed-maxudamanoxerew.pdf
    • https://cdn-cms.f-static.net/uploads/4381105/normal_6025f90b1b8c7.pdf
    • https://cdn.sqhk.co/vekudaselux/hSghNjf/apple_music_family_plan_not_working.pdf
    • https://lifibopunikesi.weebly.com/uploads/1/3/3/9/133999807/d5029998.pdf
    • https://cdn.sqhk.co/nojebimit/kWk04Sk/rabusizudiberilogipobu.pdf
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/7978300.pdf
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/5037748.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_169cf7df4da24ad28eb66ed8b80d5117.pdf?index=true
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_46f1d709edcc4e32bed54fcb5cb8718a.pdf?index=true
    • https://s3.amazonaws.com/sazomo/kerboodle_ocr_a_level_biology_answers.pdf
    • https://s3.amazonaws.com/nasitevu/wegofepajoxinisukobodo.pdf
    • https://s3.amazonaws.com/fomudebipefasu/the_paper_menagerie_and_other_stories_kindle.pdf
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_a334d9e3aa404fd597dca24ccbdcbbbe.pdf?index=true
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_1bcfdbed839c4a65b3ecbd1618775681.pdf?index=true
    • https://s3.amazonaws.com/fowikorejodi/42740638220.pdf
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_e3a230273cf64842ad92da3be3af243b.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_off0000fbc5.bin
ce615cace8c376ebb42a2e6ac708113b4d07abaa633dc8b22d0a351061f5469b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 5620 bytes
font_01_sfnt_off00010ee4.bin
ed16ecf57536252f8c94198ed93b1a9793b06bb92fff16f819cef5eda90ec4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 10076 bytes

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