Malicious PDF — malware analysis report

Static analysis result for SHA-256 71be31c093880207…

MALICIOUS

PDF

44.1 KB Created: 2020-11-08 06:38:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b3840f3f8083e2f5f40ea090621c790c SHA-1: 595d6546a37c339492362ed0bdae214100c787b3 SHA-256: 71be31c093880207d533f3ed56d3ebc85661e91eb46ec35e6c141fbb2856e707
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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?keyword=desert+scrub+definition PDF link annotation
    • https://tumekisegazuf.weebly.com/uploads/1/3/4/6/134611428/sepowonopetalux-vefumamemapo.pdfIn PDF document text
    • https://xavilisepu.weebly.com/uploads/1/3/4/2/134235747/18f61273ad87.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/e8be38d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5fa637ebcb5d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jozikixoxa.files.wordpress.com/2020/11/86569104578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38512203-c02d-424f-bfda-c9f704dd8854/38680555561.pdfIn PDF document text
    • https://nikukulorula.files.wordpress.com/2020/11/xekotabuzibawatosujir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e082cb3-3bee-45d7-a94b-a0a775a75f92/important_quotations_from_life_of_pi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eaefc1e-cb4a-4aa3-990f-cf6113ceff04/34179136292.pdfIn PDF document text
    • https://radunowu.files.wordpress.com/2020/11/5205605361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edaa323-4042-43e2-a1ff-8a6e036e7536/816-505-2523__-2212.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_off00006d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8A 4912 bytes
SHA-256: 73d5b355a8827857933fa838cd6112b7cab850327b410040bda67aa76a956990
font_01_sfnt_off00007e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E53 11116 bytes
SHA-256: 6895afe032e69e9c47a4c11062e447e24f799c593454dc2571152f494e6f9ace

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