Malicious PDF — malware analysis report

Static analysis result for SHA-256 175c3f958fb6c9c2…

MALICIOUS

PDF

102.5 KB Created: 2021-04-06 23:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61f6c98beaba29d91baf772684d9f1ed SHA-1: 77c57c784d7ff2dd777d77545f4f78ccc1ba82a3 SHA-256: 175c3f958fb6c9c2e19933c7b464a139d020380fe76bd96e1362203228260cd6
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://xezojetit.ru/123?utm_term=cartoons+for+learning+english+free
    • http://xokodiraki.22web.org/33835514075.pdf
    • https://cdn-cms.f-static.net/uploads/4462986/normal_6012f7b651366.pdf
    • https://cdn-cms.f-static.net/uploads/4451028/normal_5fd9135d288e7.pdf
    • https://cdn-cms.f-static.net/uploads/4379500/normal_603919567cb3e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://marilineme.epizy.com/bullet_raja_movie_720p_openload.pdf
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_54cf0a181c8f4c9b8c058077a4024c9b.pdf?index=true
    • http://mozutebileba.rf.gd/94371185150.pdf
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_110c2f11311440f99873d3c934f68a87.pdf?index=true
    • http://vofejobuvokare.rf.gd/pijetedakuji.pdf
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_24e4fb54f5e14524b0d20e9b7300dfea.pdf?index=true
    • http://kibulirol.rf.gd/bible_old_testament_malayalam.pdf
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_086c3c002a3a4bdd9765c61b37560fbc.pdf?index=true
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_ea5ffbc9f7134b6cb9399a68a9358532.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_7244a2e507754c81b33618b65772006e.pdf?index=true
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_f51a408f8b1b41d0ac1e19b51c4dd642.pdf?index=true
    • http://lubuzasoxevixan.epizy.com/best_handwriting_worksheet_maker.pdf
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_5ace8652d170464b99f7e62adb074863.pdf?index=true
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_fc5fa6e854904e3cbc6bfe147a1b7388.pdf?index=true
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_fce8d0100a3942af89b2d57522198167.pdf?index=true
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_fd474468a4a0407bba66d5c3f2992796.pdf?index=true
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_783f5e2f4b584dc3bf4508672986e9f1.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_off00015516.bin
fa23a8f36c8efa7dddd53889ee30bd9dfbe3cb65bc176f917d33960d8dd2abfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15516 4936 bytes
font_01_sfnt_off000165d6.bin
7fd8d25f9d5d5630820414203c185fdccf6eb8b1991b355ddcf910abd76de2e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165D6 11508 bytes

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