Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4a01f32dbe031e…

MALICIOUS

PDF

75.8 KB Created: 2021-02-26 09:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d82860c839cf3bdb9e10aede1d64bc34 SHA-1: 219d180fdc8840f7ad4c65339d418276768e309f SHA-256: 7d4a01f32dbe031efa8576027630b3ce7c06a02855a1a85d8ac8c7f88c85f196
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=coleman+6250+generator+price PDF link annotation
    • https://cdn.sqhk.co/woxekivepi/dggieCw/videofx_music_video_maker_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369174/normal_5fc85f34870e1.pdfIn PDF document text
    • https://debesawoxud.weebly.com/uploads/1/3/0/7/130775383/6851cf7a.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/WWhdiaP/video_player_banner_twitch_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/jdGhfig/gipujewozikak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5fc678b1e3bf3.pdfIn PDF document text
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/viwusup_guzagozelar_xekewodu.pdfIn PDF document text
    • https://limavewudadeku.weebly.com/uploads/1/3/5/3/135323498/gezamovubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_6034220017a61.pdfIn PDF document text
    • https://cdn.sqhk.co/xogodapap/enjaCje/55022525174.pdfIn PDF document text
    • https://koxowugazetumul.weebly.com/uploads/1/3/6/0/136015765/kejirav-dalomupenij-kamofem.pdfIn PDF document text
    • https://cdn.sqhk.co/tatonabufule/rojggfn/birth_year_of_jesus_christ.pdfIn PDF document text
    • https://gawowulovo.weebly.com/uploads/1/3/5/9/135966180/4956441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_60365d65b0b00.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/xigvDjh/football_caps_2_players.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/ijbTSqE/pazomogobedilizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 5532 bytes
SHA-256: 4c1d9e5dec9ee6f2d6005b81068aecae1ac6655e1ee3ae22e20cc8948d78fbe5
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 11656 bytes
SHA-256: 09ce295855fc35a902661773b89abbf62d3874d8f5cca969291e3c55ac083fc1

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