Malicious PDF — malware analysis report

Static analysis result for SHA-256 098a8af86b1176c2…

MALICIOUS

PDF

70.6 KB Created: 2021-02-19 21:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b740aa8bc4de3a7c5089618062330bb SHA-1: 5ab630105d0d7a0cfd3e37c3ac57ddfeba02b454 SHA-256: 098a8af86b1176c29480ccce33eb8f62d3fd4aea3fe300bdaee39df6f860f3e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection 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 content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wb?keyword=is%20electrical%20and%20electronic%20engineering%20good PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375209/normal_601d30cd97077.pdfIn PDF document text
    • https://widijozitumude.weebly.com/uploads/1/3/4/6/134688085/6135668.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/hggh3mH/57297000574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_5fe7e7d965352.pdfIn PDF document text
    • https://sopoxovolofu.weebly.com/uploads/1/3/4/5/134509961/pupadixokuxovi-zolido-kebufipifekelu-derisadat.pdfIn PDF document text
    • http://gdztut.com/360899231660b5q9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376088/normal_6000bd5cb871c.pdfIn PDF document text
    • http://kemytbok.xyz/61703032958nsubw.pdfIn PDF document text
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/5af2e86c4.pdfIn PDF document text
    • http://tradestaroffice.com/dark_souls_remastered_mods_ps4yavj4.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/gh6jioW/28024902343.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/kuxegu/zavojuwutudumunaw.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/30432646644.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/58888271791.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_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 5044 bytes
SHA-256: ab5289a35f313f0238e92fc8f4d068fde808b9c9441fd162f0f51a2196949c4f
font_01_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 10684 bytes
SHA-256: 9f23b25c89510c1c6b9163feec24d39c117b4fbaff8b4d7e384a6e0faab7ffda

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