Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c71ac412a547d5d…

MALICIOUS

PDF

68.5 KB Created: 2021-06-07 15:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a2082a05d2fe84e8a6a4e7f795de70b SHA-1: aa177606cd39c9042be5b16f541d2139f73c1de0 SHA-256: 1c71ac412a547d5d98eff9e3f16353647799faa7c70ce0cf8d4a6ecf0455b52a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files, many hosted on disposable domains. This technique is often used for SEO manipulation or to distribute further malicious content, aligning with phishing or malware distribution tactics.

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-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://nomylo.ru/pbw?utm_term=honda+gc160+5.0+pressure+washer+pump+oil
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/4392221.pdf
    • https://zimovezinidukiv.weebly.com/uploads/1/3/1/4/131453924/fcd81.pdf
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/xuwozizagizaxotitow.pdf
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/tagixolamupug.pdf
    • https://static.s123-cdn-static.com/uploads/4383464/normal_5ff5d8c2dde55.pdf
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/vadiluwi_tifegagemezibe.pdf
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/miwawolakuvadati.pdf
    • https://tajerupabud.weebly.com/uploads/1/3/1/1/131164315/6811446.pdf
    • https://static.s123-cdn-static.com/uploads/4454277/normal_60061dcf64d4d.pdf
    • https://static.s123-cdn-static.com/uploads/4392444/normal_60061df7e1c8e.pdf
    • https://xepolilibud.weebly.com/uploads/1/3/4/5/134591261/d7cdad2d1484.pdf
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/6784382.pdf
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/e0fecd5.pdf
    • https://zoforofutesabuw.weebly.com/uploads/1/3/4/7/134751738/jifosu_jowemirod_majunisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/590bdcc5-9a7f-46f4-8169-cb8701e12596/ncert_solutions_for_class_12_maths_free_download_chapter_6.pdf
    • https://uploads.strikinglycdn.com/files/5978cfce-fdb7-48b2-8668-3ea39ce1dd66/what_is_ppf_account_in_post_office_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/526985f2-e1c1-46dc-bab9-bed63f30481a/terebivosilixibixib.pdf
    • https://uploads.strikinglycdn.com/files/07ed0fd4-e2df-442e-8019-bb5e6a94acd8/wefisikato.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c273.bin
9089309a5ed8675b6057de86082b6f3720a7098c139fe1147e1b27919e268579		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC273 5848 bytes
font_01_sfnt_off0000d63c.bin
d1ec89c6a70c3ac4ecc3f3ce91bfb8e452dd28aa0c0f93d458d6cff04af694b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 9588 bytes
font_02_sfnt_off0000f6ec.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 4324 bytes

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