Malicious PDF — malware analysis report

Static analysis result for SHA-256 1581082f4a0770c1…

MALICIOUS

PDF

78.8 KB Created: 2020-11-05 19:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 804700fbfc515c70557531deaefa6811 SHA-1: ac417c80835c77c9150573007345e2d6cc791caa SHA-256: 1581082f4a0770c1a46d4f198745057b2fa690495296c42bf05216e67353c31a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous external links, forming a link farm, with one prominent URL pointing to a site related to pills. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links suggests an attempt to redirect users to potentially harmful content or download further malware. No scripts were extracted, but the overall structure and URL patterns indicate a malicious intent to deceive users and potentially lead them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://trafffi.ru/123?keyword=u03+white+oblong+pill+fake+pill PDF link annotation
    • https://jawemojope.weebly.com/uploads/1/3/4/3/134399256/1209924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5f8d0108277e8.pdfIn PDF document text
    • https://jabiratunibi.weebly.com/uploads/1/3/2/6/132683422/bc00e3fac5bb8d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f90ab306c49e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f88100b11055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5f9dfa1f9aac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f8f4813d63f0.pdfIn PDF document text
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/mikur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f86fc036e552.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/dd197784-8817-447e-a5bd-09e3320252bb/21193673808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc99de12-48f3-4a5f-9b80-961622458011/18026790453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db70a6b0-a8ec-4db0-bbbb-257daa2ac92d/zigexugivalowilasojuter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9639caa1-7ec8-4307-8fc0-db1d4508ca5c/8303312494.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_off0000f9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AD 5480 bytes
SHA-256: 8255b417c7ed0cc3e818387e6ab524f6abfff3c6e7c5a0b3540d8d3827755bfe
font_01_sfnt_off00010c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6F 9904 bytes
SHA-256: b306040d079ab030b29a3c8c1a3abe16a433674aee3e8fb140862686782887ae

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