Malicious PDF — malware analysis report

Static analysis result for SHA-256 941c3a3e2b323008…

MALICIOUS

PDF

76.1 KB Created: 2021-05-19 05:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 26988e4431efd0bbcc228fbe80f2fc27 SHA-1: 06671d42e74b458a8519a465548ed429aee4e6ba SHA-256: 941c3a3e2b323008532795633daf40de23cd4d87226886fb018d2e668fec150a
186 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, indicating it functions as a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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/strik?utm_term=statistics+for+dummies+pdf+2nd+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419194/normal_5ff9633c7279f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492257/normal_5fe243bfd9dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420031/normal_6050ea5fbe462.pdfIn PDF document text
    • https://wipevotabekux.weebly.com/uploads/1/3/1/6/131607119/37c2fa1f031f3b1.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/vividogoj-bolozumozux-mamedofigabiwi-josem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_604346c8e1a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_605553f4d968c.pdfIn PDF document text
    • https://zozetaxurumel.weebly.com/uploads/1/3/4/5/134590082/736491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_6010c6378d409.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486035/normal_60039cf83466e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_606e22a03cf94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fe428687b445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_601e9362b6828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469375/normal_604ebfc821b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_6030ce7267a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_60255ead7ea25.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/7484243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fcca211871ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusanobe.rf.gd/mukomapemurug.pdfIn PDF document text
    • http://wotekobadukabuz.rf.gd/alcoholes_y_fenoles_quimica_organica.pdfIn PDF document text
    • http://kumonuluzanoxa.epizy.com/47962945189.pdfIn 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_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 5504 bytes
SHA-256: cd9905ae2ab2e7a26e3a1d84f27282db8ea161b81c30f489f7951e5bbe0b0d0c
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 11268 bytes
SHA-256: 2c533ebcf691f0d1f1d9a4f4a68d8c355f4c0383918a8ea6cf398ced8f0aaf50

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