Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb15911b73e7394c…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 23:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 226784ab363d8b02fd185bc2458322ca SHA-1: 27274e1d0c5d2976b38c0827c711b7ef907aff57 SHA-256: cb15911b73e7394c21c4808e2f458ec9f8abc58ede3b5c4c3516f2471d267e5b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://lozipotod.ru/award?keyword=job+relieving+letter+pdf', indicates a lure related to job applications or official documents. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=job+relieving+letter+pdf PDF link annotation
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/turegarawoz.pdfIn PDF document text
    • https://bilezebije.weebly.com/uploads/1/3/4/3/134344171/jojasukeza-xefuvo.pdfIn PDF document text
    • https://julitigifoxa.weebly.com/uploads/1/3/4/3/134310533/lubow-mafor-dipopiwer.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/jhM8Yid/nerf_humans_vs_zombies_rules.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/minafekuduzedul.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/VhrjckA/fanoborere.pdfIn PDF document text
    • http://damvglaz2.xyz/a_court_of_mist_and_fury_hardbackzcw7w.pdfIn PDF document text
    • https://sazizilas.weebly.com/uploads/1/3/0/8/130874530/detamuvukemumu.pdfIn PDF document text
    • http://marketitaly.pro/886077237475a09j.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/hjzjcKR/ninja_superhero_fighting_games_city_kung_fu_fight.pdfIn PDF document text
    • https://navojinalano.weebly.com/uploads/1/3/4/7/134755450/mewukonapejaje-xawutirap-walumeb-wizeginabode.pdfIn PDF document text
    • http://heartcenteredequestrian.com/gosemavawagelabuq76g7.pdfIn PDF document text
    • https://mabulibatelirip.weebly.com/uploads/1/3/4/5/134597637/zogumis.pdfIn PDF document text
    • https://wiwazojuxosupud.weebly.com/uploads/1/3/1/3/131379189/0f935380f.pdfIn PDF document text
    • http://mgacessoria.online/jane_austen_pride_and_prejudice_read_online_free97ix1.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/rubidokezive/minecraft_skins_boy.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/57469382015.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/project_management_essentials_for_dummies_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/roland_tr-8_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/74843402144.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/nekazivibolulalomud.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_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 5012 bytes
SHA-256: deeee5142a303f3d52cbbb21735bbe1458fcc16a07ab2fd68c842e5b9b0e5728
font_01_sfnt_off000106b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B5 10992 bytes
SHA-256: 137d7bd26a532f61abbec7b6926a3bd34e0405b099f43c285837b8317008db3d

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