Malicious PDF — malware analysis report

Static analysis result for SHA-256 314074332395deee…

MALICIOUS

PDF

65.4 KB Created: 2020-11-24 00:10:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ffcfcdd3722d6b9303c8e531c553541a SHA-1: dd024b877b6975a195a2c930b32143348fd3c127 SHA-256: 314074332395deee49a43d02ad4486e4d36910186dc0fdb309d0372ef61a8ddb
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identifies it as part of a PDF link farm, with one of the URLs pointing to a suspicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • 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.
  • 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://ggtraff.ru/strik?utm_term=track+1+2+3+generator In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f92903b915bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411915/normal_5f9abf2379f28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_5f9e1dd945c12.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/5b8bf3948c1e.pdfIn PDF document text
    • https://mepotogi.weebly.com/uploads/1/3/4/7/134737672/xaguwinixupo_rodazamopikute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f8b61e5bcf47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390643/normal_5f8ea4658a09d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/minecraft_defense_tower_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1850d4-81ff-4087-8d4d-7777f2cd5d09/twinkle_twinkle_little_star_on_recorder_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53567796-4a81-49ad-a2dd-b546ab8a46b9/24612820550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1847d479-fc51-42c7-acf2-a10fa2a683de/grey_cup_2016_on_tv_ratings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902faa17-2306-409a-bc2a-889fee70fbf6/tennessee_plant_identification_guide.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_off0000c41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41B 5120 bytes
SHA-256: a7139e8761aa5ddcab85711bf802f8dbe301083a6a97c02799f9951b86a1dbfc
font_01_sfnt_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 10780 bytes
SHA-256: b73d44d2a534884e0363db002165a5fe3e38c5c443d9f785d611431b3ed527f4

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