Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e02c6425b6f985…

MALICIOUS

PDF

65.3 KB Created: 2020-11-17 15:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 33e83872d54bf950a522c3cacf829d9b SHA-1: d7bee1702cb13b041bdeaa0c0dc8a2a450da33c0 SHA-256: d8e02c6425b6f98519c5f74200a18119a33c9d1d81cd4f08e48cc3b3127f82e2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. One of the primary external URLs is 'https://traffnew.ru/aws?utm_term=cognitive+biases+in+decision+making+pdf', suggesting a phishing or spamming campaign. ClamAV also detected this as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points towards a malicious intent to redirect users to potentially harmful 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://traffnew.ru/aws?utm_term=cognitive+biases+in+decision+making+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f8b9e41235f4.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/4686902.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/julefup-vajasiboduku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f9336d76069e.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/b606eb4667.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/livivuvuwugeb/adobe_acrobat_xi_pro_trial_direct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab6d710-1fc7-4752-a035-ade3e9d6d6e5/fesofosukavovevilik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e912e599-8acd-494d-b8e5-2ff02cd42b03/gesapojevefuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7bf02c-a0d5-4eba-83d5-b8fd206313e4/the_incredible_hulk_full_movie_hd_du.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/lomufonaduguju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cdebfce-cc2e-4504-9fee-b33a59c9f08d/molubakemagewen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3914e977-a6c1-4525-ba5f-c198ad84dc8b/gun_mayhem_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087b69a5-3424-471b-801e-d61923c9e04d/getisewigaw.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_off0000c6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 5516 bytes
SHA-256: 53f75fd1355f17501eb3b312c84fadf9de08cf37dfcaea97069ba9ffde3bc6d4
font_01_sfnt_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 9060 bytes
SHA-256: d245368f71d49687afcfdd621e744ddc1108c3865f9358a9f0def8d4d46cc819

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