Malicious PDF — malware analysis report

Static analysis result for SHA-256 a950aab1b5144284…

MALICIOUS

PDF

71.6 KB Created: 2020-12-27 15:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fb52aaa47ee17e752bdb958d36949e56 SHA-1: 6a156dc32d0fba16d9f3fa86bc041fddc031ea5a SHA-256: a950aab1b5144284e652110815eaf0bc3358a83d270169bfe259b9aadd142638
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO manipulation tactic. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous URLs strongly indicate this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

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://trafftec.ru/strik?utm_term=siemens+cnc+r+parameters PDF link annotation
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/vuxanivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485926/normal_5fcd57ee2ef1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370268/normal_5fde499baa1ac.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/fesugiga-jigejibeb-jejoxez.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/WsPZ9hi/radio_rock_and_pop_online_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5fa1c89cb98a6.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/yIyggif/cover_orange_2_10-_11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425483/normal_5f9b90e416155.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/6c4c2153-e2e2-4256-8c7a-1fed0b75c8ad/business_communication_networks.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/stickman_war_2_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/maratota.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/43530094412.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/80578855198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51669d24-a782-4ef4-9f6e-c0f016797921/23223028428.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/fezemajezumesepe.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 5152 bytes
SHA-256: 3909950ddf9ab7dcf1bd2bf520c7bfcb10c82df65fd88cc14e07b66f52aabd4c
font_01_sfnt_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 10920 bytes
SHA-256: 968fd2a6ff0a5c6174eb5004744c836d865c99cc2a0c2fe13044055a178d1998

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