Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f304fb2ca2eff8…

MALICIOUS

PDF

78.6 KB Created: 2021-02-20 17:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 03cc4d81d816f4508d3d0eb2c9b2ed2d SHA-1: 83b0329ca46a95e87ad85356958d5daa8977f8d8 SHA-256: 39f304fb2ca2eff8814913cf617ff77b471179a7783786a3872ff7fc9910b23d
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with a primary one leading to "https://jacksth.ru/123?utm_term=parts+of+speech+definition+worksheet", suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains metadata related to "parts of speech definition worksheet" and the wkhtmltopdf application, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=parts+of+speech+definition+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445326/normal_5feb4f1e4bf1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405642/normal_600cbc7978d60.pdfIn PDF document text
    • http://stankoff.org/bilaspur_university_ma_private_form00tfh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5ffc6244ba46e.pdfIn PDF document text
    • http://kataeta.club/38225360853ub896.pdfIn PDF document text
    • http://vugadabupujexax.22web.org/nidezujogona.pdfIn PDF document text
    • http://itravelimpressions.com/zemoxemetuxazusupek3jz1o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481528/normal_5ffe7a2293d77.pdfIn PDF document text
    • http://akvatehnika74.ru/sopaxunowukn5gw.pdfIn PDF document text
    • http://latirogemiwufiz.22web.org/fanodojawebuberafojifiwuv.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/sedimeraxufi/69348039809.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/30896864147.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/agneepath_full_hd_video_songs_free.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_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 5368 bytes
SHA-256: e147452b936dff5440f309d12c905ea00d5089f1c305de540275a90989b15f63
font_01_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 10656 bytes
SHA-256: 6a19fc9d6608a50c09672d90d55cea6ed33302516b03727ec42d4075930b7e85

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