Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11a3a6d56a1a146…

MALICIOUS

PDF

69.8 KB Created: 2021-02-15 12:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b2dc117bb91cbd626150f747f07bf79f SHA-1: a661edd82421d9949534bfb223087d9cd3924e0c SHA-256: f11a3a6d56a1a14606e11147eeed3fce418d378b4ed214804a9f3cc6bba26849
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

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://seumenha.ru/wix?keyword=jlab+sol+answers+biology PDF link annotation
    • https://cdn.sqhk.co/golomamone/hSgdEhi/download_mine_survival_mod_apk_free_crafting.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/hd3idic/best_video_player_for_windows_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/9htsehe/regrann_repost_for_instagram.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_6011088fead2c.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/qtWKiej/define_guidebook_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivunet/gjPLyjg/how_to_get_heroes_in_grow_empire_rome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_6025fc0df3eb4.pdfIn PDF document text
    • http://hardcreditcheck.info/84101558537zgpxf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_6026f75dc5715.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378852/normal_5ff82a2e60241.pdfIn PDF document text
    • http://jukekabotika.22web.org/cyber_defence_platform.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/dPiiifm/pepofetitozasefilavezedu.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/NhdbihK/mujivu.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://leranijaw.rf.gd/binding_image_xamarin_forms.pdfIn PDF document text
    • http://bewaxupu.rf.gd/fda_laser_report.pdfIn PDF document text
    • http://zuvidetalenaras.epizy.com/wixifunoxag.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_off0000c7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CA 4884 bytes
SHA-256: 5964e00239ce7cf9368ea606215e3d7105e29dd2a4ee1909ef1c6f21b409f2fb
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 10444 bytes
SHA-256: c01118a56bb29c53bcf960e6eb8af7308e54c118c84c0c75f8b6028d1a232835
font_02_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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