Malicious PDF — malware analysis report

Static analysis result for SHA-256 194a1348b8fea276…

MALICIOUS

PDF

73.0 KB Created: 2021-02-14 21:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ff1ad7e3cc28b922e72231cd57c61ce2 SHA-1: 7d9120b452a8d8d00f738b685f8fca8e7a7c424e SHA-256: 194a1348b8fea276a0f04472e51081a33b40e11eafb0c1dd329026e5027f8a33
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable domains or hosting services, suggesting a phishing or SEO spam campaign. While no scripts were extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious websites.

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://druttle.ru/aws?utm_term=free+family+feud+powerpoint+2016+template PDF link annotation
    • https://cdn.sqhk.co/regomesu/Bhdgiij/41479952237.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/de709.pdfIn PDF document text
    • http://it50off.pro/gefonirajabofowovulabvq4ec.pdfIn PDF document text
    • https://tijirurilulade.weebly.com/uploads/1/3/4/3/134312421/digap_xigunufugu_buruputowebej.pdfIn PDF document text
    • http://hookup754.fun/acg_practice_guidelines_crohn_s_disease5xtg4.pdfIn PDF document text
    • http://verifiedbadges-form.com/cisco_ise_high_level_design_document_template63ksm.pdfIn PDF document text
    • https://dirotazu.weebly.com/uploads/1/3/1/0/131070105/xuzaxefemodar-kezakonedo.pdfIn PDF document text
    • https://zaporori.weebly.com/uploads/1/3/4/1/134131460/jetesofajojukop.pdfIn PDF document text
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/bumejabovomen_tefifijenosa_zugofuva.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/97747660698ikv15.pdfIn PDF document text
    • https://birivisixakaxe.weebly.com/uploads/1/3/4/6/134608058/bitaxob.pdfIn PDF document text
    • http://bigno.space/dukuwekepdnn7v.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/iagcgdd/emergency_room_cost_per_day.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/pirofopafu/bollywood_movies_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/semi_block_style_business_letter_format_sample.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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 5636 bytes
SHA-256: 84ccbf210bf5deab5749729a3bc0f07ded361505cca8166f0b35e58fe6532699
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 10420 bytes
SHA-256: 32aecef32c93c3767e08324aa5203677c55791e3539174fb18605b55b6eaca03

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