Malicious PDF — malware analysis report

Static analysis result for SHA-256 0209cb9abfdc1ce7…

MALICIOUS

PDF

100.0 KB Created: 2021-03-23 22:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bfbe437d6e11c8e644376da219359aae SHA-1: 23ca7f7b594ce538b740092446c9aa14185dc94a SHA-256: 0209cb9abfdc1ce706751822c21e57d6fb1a8c0466277071ed4a9c948fb1101d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=biblical+verse+on+answered+prayers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5fd2c97480eb2.pdfIn PDF document text
    • https://cdn.sqhk.co/zevijevam/fNjjwhc/sejazobugomevuzab.pdfIn PDF document text
    • http://worldthailand.fun/possessive_nouns_worksheet_for_grade_3v3yvy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_600bbde14281b.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/jcsgeBX/93058035454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473642/normal_6001c4a8b18a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372074/normal_5ff438049e241.pdfIn PDF document text
    • https://cdn.sqhk.co/niminililez/m16sJVZ/anita_blake_burnt_offerings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385869/normal_602b7957b0988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_6041784899c14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414334/normal_5ff55bf646005.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/iRjbBij/arcade_96_mamer.pdfIn PDF document text
    • http://7lessons.space/self_destructive_beliefs_questionnaireszjcw.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/jjUhfab/bigowazibamole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26346de6-a36b-486a-a7ec-3eb86793b05c/2020_honda_rebel_300_gas_mileage.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_4976c13f4c0847bab6eee17ae148422d.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_1917932e5e69457080caadf8c350387c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5357fc2-b564-4d8f-b660-1e743eadacdf/ruud_hot_water_heater_manual.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_off00014c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0E 5508 bytes
SHA-256: 87513f45d1d3a6507d1de5f25818c6549044a1fb3687d3b501e386763a4c8eeb
font_01_sfnt_off00015ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF2 10380 bytes
SHA-256: 4d93bfa5c585c017d23609311c9ffd2378de5ee699dcdfdd3d15471ef62a9a60

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