Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36b96f9eafad525…

MALICIOUS

PDF

68.2 KB Created: 2021-01-12 14:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4fc378c415c8317b51d7f1d4da78b355 SHA-1: d9bc9566a5facf0e56bd32429706a7a19ba262aa SHA-256: c36b96f9eafad525768041fcaac1e43b1e69becee2a1c0991ebcec6c8141c641
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, including one pointing to 'traffking.ru'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of many links to disposable hosting services further supports the classification as a malicious link farm.

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://traffking.ru/aws?utm_term=cal+king+bed+platform PDF link annotation
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/5150907.pdfIn PDF document text
    • https://site-1173264.mozfiles.com/files/1173264/vexusuzojokux.pdfIn PDF document text
    • https://site-1175138.mozfiles.com/files/1175138/idle_roller_coaster_hack_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416331/normal_5fc756022a925.pdfIn PDF document text
    • https://judikojegewag.weebly.com/uploads/1/3/4/5/134583508/9d8522181.pdfIn PDF document text
    • https://site-1167961.mozfiles.com/files/1167961/starz_customer_service_telephone_number.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/7788985.pdfIn PDF document text
    • https://degitetebumike.weebly.com/uploads/1/3/1/8/131857056/281827b.pdfIn PDF document text
    • https://site-1175725.mozfiles.com/files/1175725/56749069089.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/94128123607.pdfIn PDF document text
    • https://site-1167927.mozfiles.com/files/1167927/fox_girl_anime_wallpaper_hd.pdfIn PDF document text
    • https://site-1172418.mozfiles.com/files/1172418/women_s_college_basketball_time_periods.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
    • https://s3.amazonaws.com/mefovu/gudasexut.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/divamiredijigarasawepubi.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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 5200 bytes
SHA-256: 2c8a85a3dab6707a1c901d1ecfdde4d62b7bbaf1b727d8423d9f89250c91fcf7
font_01_sfnt_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 10184 bytes
SHA-256: 421a2d5fac08e0c871e1c59fc49df6f0afcc76db903b647d70baa334761ecdf2
font_02_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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