Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ced8134cf1dac3…

MALICIOUS

PDF

70.5 KB Created: 2021-03-03 17:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ffabdd0a68e99357f2888cf937f26aa SHA-1: 74a29df24648c7a27a2a6b38036a471f5453024e SHA-256: 81ced8134cf1dac3329848783b1f3d6eb74cd76cfc078fedac62dacd3c8b2701
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 the document body text explicitly mentions 'free roblox gift card codes' and 'no human verification'. This strongly suggests a phishing or scam attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to a malicious site or a downloader.

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://gimoguvi.ru/wix?keyword=free+roblox+gift+card+codes+2020+unused+no+human+verification PDF link annotation
    • http://rababevaju.22web.org/nibakibibanajikedukal.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/wizards_and_warriors_pc_cheats.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/wise_behavioral_services_llc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370265/normal_5fe11a3e83496.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/43737363564.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/macys_walt_whitman_mall_hours.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_60041cd2bd6d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389585/normal_6003d01a069ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_602117ddae81c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_603b27cf7ab4d.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/nakevoja/escala_de_barthel_modificada_portugal.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/62043516151.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/business_case_competition.pdfIn PDF document text
    • http://nalejunubotuw.rf.gd/desalosuxigobolemi.pdfIn PDF document text
    • http://jokosen.atwebpages.com/irobot_virtual_wall_scheduler_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_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 5932 bytes
SHA-256: 69ac1084e207c0350d182d0c00247f69389f59ef92bf6d075ae043e724949a97
font_01_sfnt_off0000e77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77E 10824 bytes
SHA-256: f32727bd7e6577ca6744625a1a1c7173afdff0a7ade4febfe612e0a29493f35c

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