Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ea32efd3287ed2…

MALICIOUS

PDF

76.0 KB Created: 2021-02-17 06:00:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c80ad0e3d894d1888c8215535d92d29e SHA-1: c201c24c5886bbb48f44e7b6a31b7d3b1a503036 SHA-256: 12ea32efd3287ed2f6429868b6f1f3200974e43307df03b2196976cf899ef8ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=bissell+proheat+2x+upright+carpet+cleaner+reviews PDF link annotation
    • https://cdn.sqhk.co/runetonorox/bvgddgh/sumalejisiruf.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/egj9bjh/30074926748.pdfIn PDF document text
    • http://zorimiba.iblogger.org/icc_cricket_rules_book_in_file.pdfIn PDF document text
    • http://hamsterbig.com/pumuxevekebizoxipulamoxghx88.pdfIn PDF document text
    • http://lasleymarkt.ru/balloon_dog_art3aaxk.pdfIn PDF document text
    • http://ketotreno.buzz/mavogitafogovexah6se.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/dzhdhfP/3045460776.pdfIn PDF document text
    • http://btsworld.org/electrician_apprenticeship_oregon_wages1t7ju.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/hj3Msih/9670764074.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/gnia7jd/tezoxizufixonudeg.pdfIn PDF document text
    • https://cdn.sqhk.co/zanivuwiduvo/idhGnEx/6842683716.pdfIn PDF document text
    • http://gravkamen.ru/buzz_lightyear_space_ranger_spin_disney_world_tipsoijby.pdfIn PDF document text
    • http://cashbackmoney.info/fraktur_collum_humeriubena.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savapiwanew.epizy.com/rureronetotu.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/arnold-_chiari_malformation_type_2.pdfIn PDF document text
    • http://poxizaxo.epizy.com/classification_of_animals_worksheet_for_grade_7.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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 5596 bytes
SHA-256: 17d1acbaee0e8694552e5389e53172a7b5d8e4e40e363ace0c0a65d6e086cceb
font_01_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 11372 bytes
SHA-256: 44e4a5f891f1d15231544972ccb8bcae5f915176e5e30684121484aafb4994f9

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