Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f493e9c63710588…

MALICIOUS

PDF

68.0 KB Created: 2020-11-13 00:02:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3f206cd42bc42acbdbea455a7e4d8f4d SHA-1: e7d609f786b3e376661f0001fa83bd11a6ffd033 SHA-256: 4f493e9c63710588e63c785c8851c082dabe0ccb9da7a44d57a9b526f4f4ab2b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable infrastructure. One critical heuristic indicates these links lead to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish for credentials or distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://ggtraff.ru/strik?utm_term=black+roots+science+facebook In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_5f9c0dbb78ac5.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/fedug.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/jomukirenetalezatobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f895926406a6.pdfIn PDF document text
    • https://kimiragijasem.weebly.com/uploads/1/3/4/0/134096233/5140394.pdfIn PDF document text
    • https://gikanirirexenad.weebly.com/uploads/1/3/0/7/130776133/98daf3771c40a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446027/normal_5faac14092184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f8712df8fb87.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/5341872.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/9cc69fa9-8abf-49a6-b5a2-e11b334ecd83/91654202070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5918d6e0-0ac5-4b44-bc88-2343b35f9820/fitewukufotarewexax.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/best_live_tv_apk_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b19439-69e6-489d-9bf1-c7b1afaade55/51532501665.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/ignou_assignment_front_page_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5575cab5-ae4b-4492-be98-46428cfe940b/taxonomia_de_bloom_y_marzano.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_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 5128 bytes
SHA-256: 358916e52fdbf4a280e1236c18db40d88d2285fefece1fc4a4db7b9f243fc1fa
font_01_sfnt_off0000dd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 11184 bytes
SHA-256: 6acd69e529b527c7bfa68e91f035c24f33e71eba0dc8e3389332172ba1590481

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