Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3df80db7adda164…

MALICIOUS

PDF

76.6 KB Created: 2021-04-09 11:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e960b9b470fa2dd35991577cc035fa89 SHA-1: e7a12a93d25a6e36781569a309a9ef04e37c9596 SHA-256: a3df80db7adda1643317bd1aee89133d952de92b5a8e4dd6bd978ac7e116c69b
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=no+logo+baseball+hats PDF link annotation
    • https://cdn.sqhk.co/wepurodapike/isjgXgc/contemporary_business_management_issues.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/jajexuzezirepet-wukilol.pdfIn PDF document text
    • http://optamorem.com/under_the_dome_season_1_free_downloadb0ma9.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/ugly_love_read_online.pdfIn PDF document text
    • http://mgacessoria.online/97716269234byeaz.pdfIn PDF document text
    • https://cdn.sqhk.co/zafazegig/ihurhaM/perfect_piano_guys_chords.pdfIn PDF document text
    • https://dagagiketilijo.weebly.com/uploads/1/3/4/3/134312633/xaloduj.pdfIn PDF document text
    • http://igbusinessabouthelp.com/68075959279jss41.pdfIn PDF document text
    • https://kobafadovuzek.weebly.com/uploads/1/3/4/3/134311208/bb0f4de31a9a.pdfIn PDF document text
    • http://hairsprof.ru/stihl_ms_170_bar_and_chain_replacementria1c.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/54885295746.pdfIn PDF document text
    • https://cdn.sqhk.co/sovajepuxe/jcjjvIH/sevanuta.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/5456175.pdfIn PDF document text
    • https://cdn.sqhk.co/bisulalu/cEh3FRH/36050953022.pdfIn PDF document text
    • http://mikrotikwizard.com/44032510812y383i.pdfIn PDF document text
    • https://cdn.sqhk.co/zozimevoket/iaHgchd/zombie_apocalypse_survival_kit.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/d5f6e5ab-557a-4da8-b9d4-8a435d587a14/igora_vibrance_gloss_and_tone_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/32321228323.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/29340953551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737b24ff-306f-4ca3-81bf-1eb1aa0fe017/midland_wr-100_squeal.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/93519640660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a9d2e0-c848-43b2-9e85-9c2a0d8eb14b/tutivikirezejazejajetax.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_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 4960 bytes
SHA-256: f95b1ac486aa2a20545e444c3b17f6068f7df1f217764da3c57f915475621fe9
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 10772 bytes
SHA-256: 6def4dadab2a7e12d55f97adf60d503db9a4c0ea1907e064d03c8960da6aed1f

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