Malicious PDF — malware analysis report

Static analysis result for SHA-256 844afe0b74b6fea2…

MALICIOUS

PDF

78.7 KB Created: 2021-04-24 03:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0da7fd7484c05db326d6e4eaa416993e SHA-1: c006d4ab2547838aceff5c18a44d099313b05b4e SHA-256: 844afe0b74b6fea2bfcfffd0987f669e4e26ce33a858e09d65766369f888c4bb
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or scam attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The embedded content, though heavily obfuscated, appears to be part of a lure, likely related to the 'what is a synonym for touchy' query found in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jottigo.ru/strik?utm_term=what+is+a+synonym+for+touchy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485695/normal_603f91908f603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_60548bfd6568d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409614/normal_5ff17f3b53a76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481170/normal_5fcee8a3898b0.pdfIn PDF document text
    • http://prizinsta365.website/how_long_to_cook_boston_butt_on_stove44pcl.pdfIn PDF document text
    • http://koreanluxe.com/92180914550gfqwt.pdfIn PDF document text
    • http://radafogibivos.iblogger.org/breath_of_the_wild_strategy_guide_download.pdfIn PDF document text
    • http://srakan.space/english_book_class_102595d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_60258f244b747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_60395151ea48a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_600e4901e896b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_605b78b952e93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373241/normal_5fde84fc13da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368467/normal_606ac612dad02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60324db213044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468828/normal_60352471e34b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_6023925defeaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_600e50d4112b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_603af6b20cea1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_32ae93d178224a78b084a0bb338ec03b.pdf?index=trueIn PDF document text
    • http://wotixebapaxuwug.rf.gd/66347990760.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_1e2b416622044caeb4ce7c2f42c0f9fd.pdf?index=trueIn PDF document text
    • http://nonapenavepuweb.rf.gd/rilifokikexonijosapakuna.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_c3cae788701c4d09a965e2b5cf169520.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_off0000e719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE719 4968 bytes
SHA-256: 2309de2bc5d606a7d0cea5b9c59f71470eea1e996e1820d40cb3e33df38de088
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 11588 bytes
SHA-256: ea447d7d413a67a35595da7d2c7601fd3625bdc3230fc2a8b0990ae91d1223a9
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3