Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a559319b64bf0af…

MALICIOUS

PDF

65.8 KB Created: 2020-11-24 22:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f033b849f4893be9c4e916ac75de389b SHA-1: e4450ede063c35aed65c2c1fb62a9eef43d307bc SHA-256: 7a559319b64bf0af36e0ba8a6b5c91bb09aa65f52c43554380f3b465cd38348c
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 numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=maths+missing+number+puzzles+with+answers PDF link annotation
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/e18a183711.pdfIn PDF document text
    • https://kadeborejegan.weebly.com/uploads/1/3/2/7/132740978/7a05326be04b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/subud/sexupiveletagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063fde49-c693-496c-9d69-f3f2a05bb4fe/64496118715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8fb2955-654b-45ec-8893-66a3820c4c58/satejibewajuvalileditik.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/le_morte_d_arthur_summary_book_20.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/climate_central_report_kerala_map.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/classifying_matter_lesson_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/69729343117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83a7c660-69a9-4bc6-a9bb-8bc9590fa975/staten_island_map_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/85316804822.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64E 5292 bytes
SHA-256: 8fd213ae6e001cdfee1b72c9f0d61adccca001812e187911e4984d9fba89a6e2
font_01_sfnt_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 10624 bytes
SHA-256: bec327113e403b4729d446ca65b111e3d11fad3d6789204ede5e6d7fabc5083d
font_02_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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