Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b4cd039958ffba…

MALICIOUS

PDF

78.6 KB Created: 2020-12-26 11:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0bc92832db673d2e06f4c6153c0d01cc SHA-1: e8b75a53afd0f07c830f6e1e5f1ac3a8ee059100 SHA-256: 99b4cd039958ffba83fc2128f2338d0a09565249230c99d7859c094b81127919
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/123?utm_term=schwinn+jaguar+cruiser+review PDF link annotation
    • https://cdn.sqhk.co/joraxeneli/hgZlRjh/hashtag_generator_app_best.pdfIn PDF document text
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/suweg_tavos_jupowisixeboji_redurafobapufum.pdfIn PDF document text
    • https://pikimitif.weebly.com/uploads/1/3/3/9/133997727/waxewo-rinejene-fodoliz.pdfIn PDF document text
    • https://koximewi.weebly.com/uploads/1/3/0/7/130775363/9806888.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/8360399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_5faaee7256fb4.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/hds088U/72064138916.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/icMgdLT/street_of_rage_4_ps4_gameplay.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/5359622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5fe580fc6769a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ce12433-7be3-401f-be43-134c18cf213d/delilenatitojumateti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c31cab78-bdd1-415d-8eda-49b5a36a5182/konji_pesida_venaam_video_song_download_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32cbbacb-25fb-4e5e-aee2-ccfd2147f2d2/94261229818.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_off0000f507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF507 5360 bytes
SHA-256: 21b7c6b8cb9ceaa4c509e3f3876250c8df0fb3c7cdf361e004a3bc7e1731928f
font_01_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 11344 bytes
SHA-256: 6338ce01babee4386ab59e47be585fc903b89c5b6dcf562a86f180f58aac95cf

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