Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a530d5b6fde504…

MALICIOUS

PDF

74.3 KB Created: 2021-03-08 19:08:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e169e7a81756c8068aaf4373e92dbfb SHA-1: ee3de8ee3be29798363c42ce83cfcaf648171ba7 SHA-256: 13a530d5b6fde50494de61a8d272d941b5fed71dc9635b1ab574966c48c0afc0
244 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or redirecting to malware. While no scripts were extracted, the primary attack vector appears to be the exploitation of user trust through deceptive links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=understanding+canadian+business+9th+edition+pdf In PDF document text
    • https://cdn.sqhk.co/jisanipu/1JE4amM/pac_man_game_boy_advance.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/9e83a192a202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_6005acc243f02.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/fMgdhiq/hopper_stranger_things_actor_death.pdfIn PDF document text
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/wufunifopomemizeko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_5fe3b82720b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_5fd9aced528d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_603860d48b634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_600cf53d9bd21.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/isgcigI/real_cake_maker_3d_game_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/qpuUFja/ludo_online_game_multiplayer.pdfIn PDF document text
    • https://lumigoxodavi.weebly.com/uploads/1/3/1/6/131606620/4488882.pdfIn PDF document text
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/tagiko.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/jjjdFvI/strategic_planning_process_company_example.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/de64df11-d2e4-4683-9ec4-d05d06412fe9/which_of_the_following_is_a_major_difference_between_the_house_and_senate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545ed38c-cb08-480b-86d1-e88b51a59c18/20907257712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05262aa7-939a-47d2-930d-4f086425f0f3/zurumavutidigofedemepal.pdfIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_31d587ec9d69454c8e523d13ba9a7443.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_00b1d77f3b4b4e1282e8be462037ec3d.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_5277c95f56a94bdca43ff2c882ee214f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f9e57e-cfa7-45d5-a53d-d85d590eaed6/mowopidagafesewuxaluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/befc61dd-12bf-40ce-9a08-41486401e097/72107003501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0abc1c4-8189-4483-b1df-6d0e7610570c/63384874339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2593c253-fff2-4620-aff9-83d38fc63627/24656706278.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_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 5672 bytes
SHA-256: 92f435a2386e00d6015af7de4e3a9f332e39f09c999b7d1c09e350c08162d043
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 9976 bytes
SHA-256: 5f65f920f01ba1caaed338aefdf5bb2ad731c7002426cd571adfe05e3c71cfff