Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9796248bff35c2…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 21:45:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e4ed36bc9f8b749419fb5b693bdd44e SHA-1: 89fdd6320d695429c4b9129f97e27f039b80df99 SHA-256: ac9796248bff35c24cb8dbc0ad2425636e9ef1998b94bb95a37f7ff96b7048a3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=sra+corrective+reading+lesson+plan+template
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/3841657.pdf
    • https://static.s123-cdn-static.com/uploads/4421336/normal_5ff196a88ea37.pdf
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fede808c86ac.pdf
    • https://cdn-cms.f-static.net/uploads/4392462/normal_5fd1a88ac362b.pdf
    • https://static.s123-cdn-static.com/uploads/4421199/normal_5ff2b3a503229.pdf
    • https://nobarikanu.weebly.com/uploads/1/3/1/4/131483152/lavulavatovud_kojazit.pdf
    • http://famozosivupiwij.sportsontheweb.net/disoluxepasanomuju.pdf
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/xujoduvomenetesim.pdf
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/pisowakotudo-tiravo-sumonozuzuxav.pdf
    • https://cdn-cms.f-static.net/uploads/4382420/normal_5fe93a3a387d1.pdf
    • http://jemulobapamiwu.mywebcommunity.org/71358829483.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ruzaganog/curriculum_map_template_higher_education.pdf
    • https://s3.amazonaws.com/palevijuj/bbc_radio_scotland_sports_reporters.pdf
    • https://s3.amazonaws.com/neviwove/eat_what_you_watch_cookbook_review.pdf
    • http://liraperuwuw.atwebpages.com/dufiler.pdf
    • https://s3.amazonaws.com/luropi/mapepekotuzawupobawemet.pdf
    • https://s3.amazonaws.com/zepifudoxapo/6185859277.pdf
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_959696478edd4e45b1c8da280949b909.pdf?index=true
    • https://s3.amazonaws.com/pululusodogi/nixew.pdf
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_909e20ef8e2842ccabc29cf461b8da97.pdf?index=true
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_9dc6f0054870487185416bcd8759a3a9.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_off0000f1ec.bin
afc5cd2e874f872bff11bcaa3b332c2806fedf66f1481ec1c78430590689d01e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 5556 bytes
font_01_sfnt_off000104cc.bin
437343e752aa8f2fc2b1965aeb4caf9bd7d5e0b26a8b4939998d4d739cdc4d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 10672 bytes

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