Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc30265e2afb0533…

MALICIOUS

PDF

64.0 KB Created: 2021-02-19 01:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: adc33529ed9f3a7977dc893df7f7fa19 SHA-1: df6a24dd447a2847252b2551d1cdf1a2522d3e01 SHA-256: cc30265e2afb053377d420b485a2ed0e9c00392e63369f91b9aee8f0c818133d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs suggest an attempt to redirect users to potentially malicious content or exploit kits.

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://jacksth.ru/123?utm_term=niv+bible+study+commentary+pdf PDF link annotation
    • http://parralax.net/favezijunebibvisoq.pdfIn PDF document text
    • https://cdn.sqhk.co/xanodujijefu/giQYsjj/clubhouse_invite_only.pdfIn PDF document text
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/tasugugusonaru.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/fnLigie/movistar_colombia_planes_de_datos.pdfIn PDF document text
    • https://kozinawesi.weebly.com/uploads/1/3/3/9/133997283/585635.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/1VDqheg/red_ball_2_game_online_free.pdfIn PDF document text
    • http://gooddevice-online.com/sarawijord0cqj.pdfIn PDF document text
    • http://mx50off.info/minutes_of_meeting_template_word_2013x1te3.pdfIn PDF document text
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/teruwujonupi.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/jjhhhxt/42559735023.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/HVia9wC/buzzer_beater_meaning_in_urdu.pdfIn PDF document text
    • http://5coupon.info/netflix_macbook_airnc5zz.pdfIn PDF document text
    • https://marotebage.weebly.com/uploads/1/3/4/7/134712984/68bc325427cc.pdfIn PDF document text
    • http://rocketdocs.us/981584174908rq4n.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/ek4thc7/72827137386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/66680124645.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_off0000bdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCD 5572 bytes
SHA-256: 192e8488e514b23b7f10d353b4e31635b5c76ec1dc94fa3a1d22e3556e98c500
font_01_sfnt_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 10240 bytes
SHA-256: c72e21071015de4760c519d057e90d414c41314585f594fa9558730548e9879e

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