Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c3fffee111ef88…

MALICIOUS

PDF

83.4 KB Created: 2021-02-22 13:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3f862bf6b2aa8f70f664e003136a69aa SHA-1: aa5d33a17493043d5ee540f70293436642db3b24 SHA-256: c6c3fffee111ef8810a7817ccbb43da115797907e038eb49944fb713ed263b4f
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 link farms, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into visiting harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=how+to+fix+clogged+printer+nozzle PDF link annotation
    • https://cdn.sqhk.co/mozulunilex/gfQQPjj/dirt_bike_drift_racing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385415/normal_5fce76f419c7e.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwalimo/jtA7jgZ/colored_contacts_near_me_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/j7ibjjf/ravaserukegepe.pdfIn PDF document text
    • http://solerizimifo.iblogger.org/65355510672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5ffd4515e9298.pdfIn PDF document text
    • http://viwavorikag.22web.org/lulesokaturexig.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/igBjgZu/brain_wash_amazing_jigsaw_thinking_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/egc5iaj/57680380797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_602e43fbd3512.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/hczhbjj/heroes_strike_moba_4v4_battle_royale_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/ghhggOY/sanujipukezilotuvexot.pdfIn PDF document text
    • http://zexawil.22web.org/kifuxujonuwo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_5fc67b82177e8.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/WW4Tfma/bounce_house_rentals_near_me_cheap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ferisokigidakal.rf.gd/fisifewojenisol.pdfIn PDF document text
    • http://gusozafameximi.epizy.com/x_street_fighter_mod_apk.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/3435897805.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 4896 bytes
SHA-256: 30dcfa91d00970eb289519eeb80645887c126bc014584e790c1cbd1a72f1e618
font_01_sfnt_off00010eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEF 10196 bytes
SHA-256: b328727d5bea3bf2b0de99718c82d5388bbf3cd35d84daa1d9d0380113595be9
font_02_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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