Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31cba91e327a824…

MALICIOUS

PDF

75.4 KB Created: 2021-05-22 03:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9fb760588e1625724742ff174620ae4f SHA-1: 2692e7d6918d2bb3fd94d02673e1f7f3a7018e37 SHA-256: f31cba91e327a8243fcd3ba5800f3518d0ffd9679ca2a1401744004c149451a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/strik?utm_term=android+studio+sdk+location+not+found+mac PDF link annotation
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/78d0caba95d5ec.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/7c0f34b4cbfa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_6043321502f4e.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/04078438b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485305/normal_601543f0ec289.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/finiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_6010e430e1933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_5fd7b3702415d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_6050ce28798b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487386/normal_60038d672b56c.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/lovetijif/subobodifixunedafemunuxuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/62187724763.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/lubefogipuzevenesove.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/67364101409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d97dab4-ebb0-4011-b241-436a265b518c/48603569754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b710fa-7551-4963-a5b3-b7c833ae25b9/dixie_chopper_silver_eagle_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/5g_beamforming_algorithm.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_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 5220 bytes
SHA-256: ef0695962ebfe782fe174ef2a5d3439539a95525da3cb77b9a29802706ffbeb6
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 11424 bytes
SHA-256: da7090f3286286ab2bf8d54973d3bfd35bee6d0f22a4106857945dd873973920

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