Malicious PDF — malware analysis report

Static analysis result for SHA-256 593525680d5c70f4…

MALICIOUS

PDF

78.0 KB Created: 2021-01-08 19:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c7dd6352eab073f5c4fe59188d7cd5de SHA-1: 8d072404440a973a66631c790911cd64db3dc41f SHA-256: 593525680d5c70f4e16e9e42cd81d2d2a5a40c94e97f858088f423fa0d9ceebc
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 of which are to other PDFs, suggesting a link farm or a method to distribute malicious content. The primary URL, 'https://trafficel.ru/123?utm_term=lesson+master+advanced+algebra+answers', is likely a lure to direct users to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=lesson+master+advanced+algebra+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481408/normal_5faf16d4bd657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5fbefcb310d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392857/normal_5f96680772826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5f8c5ff4c433e.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/2500895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404497/normal_5fc3cefae17ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482218/normal_5fe05a775d97b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452621/normal_5ff0d6a7581d2.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/enQicge/ice_cream._cake_dairy_queen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_5fa0781e262df.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/81c7a2f8-eb8c-4680-96f5-b35d15ec1e33/tory_lanez_i_told_you_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5feb6426-f45c-4eab-9e04-87160b29e741/25096067826.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_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 5492 bytes
SHA-256: 0ec61f99cdb2462674f198e71a9594e4148541b207bc4b79bba52af4e034bf01
font_01_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 10660 bytes
SHA-256: 299958ffc573fab259748c4037e1ec6b5078ae129d7fb9daecadd197c47da92c

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