Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c23f8bcbb1195a…

MALICIOUS

PDF

66.7 KB Created: 2020-11-23 06:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e054d5c931694ae7ba0fd72fb13d27e SHA-1: 5d4ff66e9a83f1dd8c84489fb7c4561a65255fef SHA-256: c2c23f8bcbb1195a5b3b7a3bc0cf9ce4032fc2d52ad74ba1ce9b20a198ebe791
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The primary malicious URL identified is 'https://traffine.ru/aws?utm_term=last+update+facebook+apk', which is likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/aws?utm_term=last+update+facebook+apk
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f8c0f63030df.pdf
    • https://xefavona.weebly.com/uploads/1/3/4/4/134463094/444211819c4a3.pdf
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/0297d43fe8.pdf
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f88c7e4ed361.pdf
    • https://veforolafumokiv.weebly.com/uploads/1/3/4/3/134340642/zijosurunufepuza.pdf
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/f6cdf73d581d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4366ecf4-d419-4815-a6d4-891a4fb58876/2000_ford_expedition_cranks_but_wont.pdf
    • https://uploads.strikinglycdn.com/files/8f82b572-0b58-4d54-ae35-01383705b9c4/vuwagebeb.pdf
    • https://uploads.strikinglycdn.com/files/8b2844a9-8a80-429a-ba49-c04469f6a667/sandman_completo.pdf
    • https://uploads.strikinglycdn.com/files/2651141b-a8a1-4c3d-9cc8-eb5cc8cc0b93/lorifazun.pdf
    • https://uploads.strikinglycdn.com/files/c326a584-7099-4bf6-88e2-0813b28c1e67/12252100898.pdf
    • https://uploads.strikinglycdn.com/files/df910c95-b84c-421b-8129-1765fd507ad1/stansbury_island_camping.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f9.bin
1080aa6744489753dfe3d81ba22a344bc5281f04fb134b507f0d585d5e19e478
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 5168 bytes
font_01_sfnt_off0000daa4.bin
839ea923d3c73813a8bdc6ea97498a6f52038d3d366cb1f4f56546b88a8ad7bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10332 bytes