Malicious PDF — malware analysis report

Static analysis result for SHA-256 099f390899f58851…

MALICIOUS

PDF

79.2 KB Created: 2021-05-28 14:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14a602bdd821823abedb183aecda965d SHA-1: 23cc93c78ace3f0191ae00f4430c57993eb7cf51 SHA-256: 099f390899f58851736f8c86cbf132d4583337a0beddd83cc607831ca045f1a4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external PDF links. The primary URL, https://nipisod.ru/strik?utm_term=standard+proctor+compaction+test+lab+report+politeknik, suggests a potential phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and extensive external links indicate an attempt to redirect users to potentially harmful content, aligning with spearphishing tactics.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=standard+proctor+compaction+test+lab+report+politeknik
    • https://static.s123-cdn-static.com/uploads/4479942/normal_5ff2fd66d62f0.pdf
    • https://static.s123-cdn-static.com/uploads/4476302/normal_600367fa393fd.pdf
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/4929468.pdf
    • https://cdn-cms.f-static.net/uploads/4417122/normal_605644c2b3981.pdf
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fe132a343525.pdf
    • https://xepevuke.weebly.com/uploads/1/3/0/7/130775471/8746759.pdf
    • https://cdn-cms.f-static.net/uploads/4413228/normal_6069fdbf5d057.pdf
    • https://guvorike.weebly.com/uploads/1/3/4/2/134266232/0c3419e83ec415e.pdf
    • https://fupotepalakeb.weebly.com/uploads/1/3/5/3/135351483/3135660.pdf
    • https://cdn-cms.f-static.net/uploads/4450039/normal_605d66d40ed48.pdf
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/dafewub.pdf
    • https://cdn-cms.f-static.net/uploads/4391008/normal_604b55e7955c1.pdf
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/powunapafatoga_miloselap_toxozigow.pdf
    • https://cdn-cms.f-static.net/uploads/4403823/normal_605f360b5d1b0.pdf
    • https://cdn-cms.f-static.net/uploads/4426413/normal_5fd627ea42bc2.pdf
    • https://fejavemupim.weebly.com/uploads/1/3/5/3/135314508/09f76.pdf
    • https://cdn-cms.f-static.net/uploads/4425921/normal_6031be5063d67.pdf
    • https://static.s123-cdn-static.com/uploads/4367286/normal_5ff5b244a4f7a.pdf
    • https://fedubipogumuwu.weebly.com/uploads/1/3/1/3/131379546/kugusijokisifuvowo.pdf
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/7829143.pdf
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fcb77cf760ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f369.bin
7080158ecdce19cc82659ef8ec9fbd35d3ad87f2d869749eb3ccec8fd9c88ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 5528 bytes
font_01_sfnt_off00010613.bin
380c7b57c87f3476c7241afb57cd0f770a4997573c23b8801fd7c0a8de4894d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 12124 bytes

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