Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93da642a8255da6…

MALICIOUS

PDF

79.9 KB Created: 2021-03-17 16:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7e2d4af19487bf247be69a5979ecb553 SHA-1: 238868b6c582b273edd8d8a1520b35a076887332 SHA-256: c93da642a8255da6193c7f8ceb19e02f6de491e4026ec2fe2602bc438d727704
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gimoguvi.ru/strik?utm_term=wireless+communication+protocols+ppt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449419/normal_5ff2290a5628e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381962/normal_602fc743c42e9.pdfIn PDF document text
    • http://kusulapezep.iblogger.org/dimuxifokarurojo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416665/normal_5feb2de838adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5fe73d32ec18a.pdfIn PDF document text
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/c66b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fdaadde71092.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500674/normal_5fedc86054d26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454556/normal_5fff96adee923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494138/normal_6014c0ae23069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_60258d0d30839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_602680ed12043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444638/normal_5fe409e558311.pdfIn PDF document text
    • http://vutanojevi.iblogger.org/kudogegukowazajaruzirakob.pdfIn PDF document text
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/fudike_noxekakifonix_wowimofopi.pdfIn PDF document text
    • https://wegesunovajoj.weebly.com/uploads/1/3/4/8/134887244/sivebokozitavu.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/mejedemonivol_bexafida_betubamefepe.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_491ef87b861c4e6e84d10e355d9a831e.pdf?index=trueIn PDF document text
    • http://wukefomirufiza.rf.gd/nurajafenegivebenibiv.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_abddc3c5073e4ccfba30ddd571529e62.pdf?index=trueIn PDF document text
    • http://nojodesara.epizy.com/sasipotefobir.pdfIn PDF document text
    • http://xefujexomige.epizy.com/words_to_this_is_amazing_grace_by_phil_wickham.pdfIn PDF document text
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_0d67d87b7a6649878ed73daf4503c91e.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_2abddd24a00d44f2976cfdb83819cc64.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 1880 bytes
SHA-256: cdf270133a1acd589d40515574fb0166eb617f993d85dbbb132dd06602cf82f5
font_01_sfnt_off0000fbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 5092 bytes
SHA-256: 3b09265dcfe4e862c531bed226fecf48a6ab325709e8c2dfbf30123127e184a4
font_02_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 10784 bytes
SHA-256: 75b84f1879138dacf0d42d04440835808d16dade83c3995a06a3dabbe85b1bac

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