Malicious PDF — malware analysis report

Static analysis result for SHA-256 106c91185f2424dd…

MALICIOUS

PDF

80.0 KB Created: 2021-03-13 20:48:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 169da14ad860090d568a9a229f2625d8 SHA-1: cae1476f952e01268008d0e3c6e198e4e2236ff5 SHA-256: 106c91185f2424ddbe9cd7bbcf2e6fe823ab581c162dc7bdfccf4d84596a5978
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded links point to various domains, including disposable ones, reinforcing the link farm and potential distribution aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/award?keyword=simplemente+inolvidable+mary+balogh+descargar+pdf PDF link annotation
    • https://cdn.sqhk.co/bopibege/gjjdii3/kobusejirizadaguku.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/phciegd/stickman_fighter_dragon_ball.pdfIn PDF document text
    • http://profapp.pro/the_blood_spattered_bride_1972_freevmmy1.pdfIn PDF document text
    • https://cdn.sqhk.co/sisagoku/hhbhhtN/g_stomper_producer_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/ihSEjdp/27003852584.pdfIn PDF document text
    • http://electriccannoz.club/simonaveresf5aky.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/tuxuzeresf3.pdfIn PDF document text
    • http://supernefritroller.xyz/ant_man_hd_imagesbt3n7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_5a0c3a08c55b442d8be3b78847b979ac.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_5629f9d515ef458594f4834d38a193c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f9e254-d864-43e3-bb60-3821c7b00fc5/natifuzijojojotigami.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/jaipur_city_palace_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/53182621466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e7e195f-483f-407c-a917-d07ff486e404/dugemepolobabakigejij.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_075117eed0a044228956813848c4cd2c.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_6103218d06e5454aba00178b3aa38d69.pdf?index=trueIn 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_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 5976 bytes
SHA-256: ce24da812e060e6ec54ae35ee322e3f784c80b9ecadcd094ccd0afda0d905fb3
font_01_sfnt_off00010a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 11880 bytes
SHA-256: c2713dfdb786feaf1d6265263b4e7b0122048504da6596d6770051a2751d8129

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