Malicious PDF — malware analysis report

Static analysis result for SHA-256 964481512f1e24df…

MALICIOUS

PDF

73.6 KB Created: 2020-12-15 13:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3b3f80ccd8d119eab47e2bfeef4dfe4a SHA-1: 38146005ea534b81e4f675c1f6f6c3bb771ed2bf SHA-256: 964481512f1e24dfa9202d9d629ef185494e39742af2a5828ffc914c6c17eb27
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, with one pointing to 'https://s3.amazonaws.com/rimepusox/fejub.pdf'. The presence of an embedded URL in the document body further supports the attack pattern of luring users to external content. While no scripts were explicitly extracted, the nature of the PDF and its link farm suggest it's part of a campaign to drive traffic to potentially malicious or deceptive websites.

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 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://traffnew.ru/123?utm_term=star+wars+nautolan+planet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465938/normal_5fa5bb70619ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5f9af13abbda1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5fa8744f94bcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_5fadbc5da6b9c.pdfIn PDF document text
    • https://lefusavuforuv.weebly.com/uploads/1/3/4/4/134490278/4937158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_5fbc5812b891f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f8d2fd7a086c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rimepusox/fejub.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf52a44e98326c020756b4/1606374055200/kitchenaid_dryer_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/kdigo_guidelines_transplant_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/dofeje.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/statistical_treatment_of_experimental_data_young.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/6581818096.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/bangladesh_flag_vector_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7856643c5ee75bf2cb04e/t/5fc9f2d01a258d244fe25b3c/1607070417677/download_game_zombie_tsunami_mod_apk_putra_adam.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 4844 bytes
SHA-256: 280385e99e8473dda2410dea4938be3dccf73d8c1161d53a3117c7e89406117c
font_01_sfnt_off0000e8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 10224 bytes
SHA-256: 19210d261ac3a9461ceea65b70e9aa96fa9bf6cb9a3ff6bd4120a4a764f0aa7d
font_02_sfnt_off00010b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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