Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29327ab7ef3df34…

MALICIOUS

PDF

70.6 KB Created: 2021-02-15 11:52:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 80caed56a1c95054285469ee5c49d911 SHA-1: 2ebdb09ac513ae37981dd2fe3dcefe372417f81d SHA-256: c29327ab7ef3df34ac7606b368abe00131793e3ceac4b4896b520a88dfe36303
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a potential link farm. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing sites, masquerading as benign content like game links or educational materials. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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 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.
  • 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://seumenha.ru/wix?keyword=boxhead+unblocked+games+77 PDF link annotation
    • http://fbdirect.site/langston_hughes_a_dream_deferreddzajk.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/gdMidie/penar.pdfIn PDF document text
    • https://wibawewema.weebly.com/uploads/1/3/1/3/131398479/9bf07b945e.pdfIn PDF document text
    • https://cdn.sqhk.co/ledazukogim/giihjii/lokajijoperaliwobusimon.pdfIn PDF document text
    • https://cdn.sqhk.co/terisuzuji/hfxiesd/printable_spelling_worksheets_grade_2.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuxutagisu/hcWxfih/tugepujikorixowisomomobo.pdfIn PDF document text
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/xowureb_lokem_zaxetefitotid_guwepot.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/9162023.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/ssigEie/79175698185.pdfIn PDF document text
    • http://katermore.ru/31187187183ciooi.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/gotomuraribiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukajevo/2008_audi_a3_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/addition_worksheets_sums_to_10.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/demon_hunter_pvp_guide_8._1._5.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/large_label_template_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/oregon_dmv_permit_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/86002023348.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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 5660 bytes
SHA-256: d4547520ef7b0665048e6b392875bdb52623cc03a2744c4a8dd28d6a32fafac8
font_01_sfnt_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 10600 bytes
SHA-256: 2edc5d530806fef50462ca32dda6a266a948f750b9f5833aa039fed4ab4dffba

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