Malicious PDF — malware analysis report

Static analysis result for SHA-256 561773c647960359…

MALICIOUS

PDF

89.6 KB Created: 2021-04-07 03:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41dd33e0b67758b33f08a860fecc662a SHA-1: bcaa5ad768a3f98e2f831dc6b15792794a6b37e7 SHA-256: 561773c64796035955994f46d3cd7657e990a5325a357e739c80b10e66a18127
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to potentially malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/strik?utm_term=baby+girl+clothes+newborn+coming+home
    • https://cdn.sqhk.co/wodaximewule/eji97jf/rechargeable_aa_battery_with_charger_price.pdf
    • https://fumamefix.weebly.com/uploads/1/3/0/8/130873833/45369.pdf
    • http://sexefowox.22web.org/76351352818.pdf
    • https://cdn.sqhk.co/tenalewi/jbjbAij/18660570608.pdf
    • http://latujor.22web.org/nuzina.pdf
    • http://bobiruropiles.22web.org/effect_of_substituents_on_acidity_of_phenol.pdf
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/1283045.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_022e4b67ea2447a3bcace94872e4b42b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/012bc5ba-f279-48d0-a854-99a2b42c9af4/how_to_repair_ge_top_load_washer.pdf
    • http://rinivuwuvo.epizy.com/vonififikosuvozewusugaru.pdf
    • https://uploads.strikinglycdn.com/files/5b4178e0-7d24-4636-8d61-c29b65a3e353/lexebixororew.pdf
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_fc7527f1b8184e6494597c1523f11617.pdf?index=true
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_6e5df5c660a24179867d99359f434616.pdf?index=true
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_db5b0ef8343d42788928d5cfbb354c1a.pdf?index=true
    • http://gotafoveguna.rf.gd/93363406517.pdf
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_31f9e1f8bf5949d38514c04e728cd621.pdf?index=true
    • https://uploads.strikinglycdn.com/files/30fecb33-a50f-4a9f-9ffa-b8f5fd0de0f2/xokeko.pdf
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_7b8d1d8a299342de9183514f6ad6a257.pdf?index=true
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_540524222c404c3895f74ac46d2612e9.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_off00011d7a.bin
ba1758b5368976b066100e61e7be44b3d1c1965363f5d9ffe3f17d19c431dcd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 5596 bytes
font_01_sfnt_off00013071.bin
07a26707bedbcd2e9c29670d14b2dc8ea92241190d64afb112dfd6fb59155c23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13071 11444 bytes

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