Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e3a445973b5b3fd…

MALICIOUS

PDF

56.2 KB Created: 2020-06-18 05:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: a81f12787ae43a4f6fa5f3d3cd9b4cf3 SHA-1: 74462ac0f765405ba5afbf992ae4506133f138dc SHA-256: 4e3a445973b5b3fda33c24f5b0c24f85667a93cdf060b508e49e54c5c3057662
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of external links, many of which follow a similar numeric slug pattern, indicating a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'gsm jammer pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to drive traffic to potentially malicious or scam-related websites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://tinatimeofficesolutions.net/uploads/1/3/0/6/130640000/130640000.html#gsm+jammer+pdf PDF link annotation
    • http://hostmaster.ultrasoundbabyface.com/uploads/1/3/0/7/130739297/a006b43.pdfIn PDF document text
    • http://condoinbiloxi.rentals/uploads/1/3/1/3/131381605/fa9056bb4be201e.pdfIn PDF document text
    • http://tbndesigns.com/uploads/1/3/1/4/131408153/74e700.pdfIn PDF document text
    • http://webmail.lisasprettypups.com/uploads/1/3/0/8/130814681/4891028.pdfIn PDF document text
    • http://tripsandvacations.net/uploads/1/3/0/8/130814179/697633.pdfIn PDF document text
    • http://hispanics2020.com/uploads/1/3/0/6/130604382/2cef6e2226.pdfIn PDF document text
    • http://214.undesirable.us/uploads/1/3/0/5/130588352/6386045.pdfIn PDF document text
    • http://teampursuit.org/uploads/1/3/0/6/130620551/1cf312f2f372ee.pdfIn PDF document text
    • http://autismeonderzoek.be/uploads/1/3/0/5/130547552/rolija.pdfIn PDF document text
    • http://joshschoonmaker.com/uploads/1/3/0/3/130313107/sidajonobuluw-xoxado-sovosawiva-dajovo.pdfIn PDF document text
    • http://marsgalleryofreusablefacemasks.com/uploads/1/3/0/5/130588795/e159dfa633c3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 6

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_off00009f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F31 4708 bytes
SHA-256: 6130b49ea5f08a1145d6102004fac17b44cc9dc01d00f658918b0461e827f178
font_01_sfnt_off0000af31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF31 10916 bytes
SHA-256: 532e66ee8153fa45a8398f769f1e5d5ea0e616140cf506dcb63197181a0f0bf3

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