Malicious PDF — malware analysis report

Static analysis result for SHA-256 2653ec159d3c54da…

MALICIOUS

PDF

64.6 KB Created: 2021-01-10 19:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7cff1f8bec3bbcad5e3876a6171b4db3 SHA-1: 7dbb66155710d55e265ff526c8ff4500f03b8c01 SHA-256: 2653ec159d3c54daf8830d1a91ff7b4666112ec234c488299aa82fe58370ecc3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting services, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=connect+math+college+algebra+answers PDF link annotation
    • https://cdn.sqhk.co/fixiwuwukufi/bPOkihE/kejoxikasivoxanexakitaba.pdfIn PDF document text
    • https://duxevuwelinabim.weebly.com/uploads/1/3/4/3/134353564/8705652.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/egGgjhb/descargar_the_simpsons_tapped_out_para_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f9a207acabb7.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/fHHghXp/galaxy_watch_3_vs_galaxy_watch_specs.pdfIn PDF document text
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/3056769.pdfIn PDF document text
    • https://site-1178634.mozfiles.com/files/1178634/guilty_gear_dizzy_father.pdfIn PDF document text
    • https://site-1168215.mozfiles.com/files/1168215/31793122140.pdfIn PDF document text
    • https://site-1176112.mozfiles.com/files/1176112/67112313232.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/regegozumekoza/oc_reference_sheet_maker.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB766 5348 bytes
SHA-256: cfd726558ab618fdc07483b758662abc862ccb135e8af523dd398ee936677509
font_01_sfnt_off0000c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 12440 bytes
SHA-256: 086abe4ecea072d6a99b378f33edfbe36e19a6f966361f19aeae8a9ad48d186a

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