Malicious PDF — malware analysis report

Static analysis result for SHA-256 9948d4bcfef906a0…

MALICIOUS

PDF

74.6 KB Created: 2020-11-19 04:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e1a3af594eba65b15f0d075c44ffadd4 SHA-1: 71d1d2b301008c1378c0c59d3ff9537be5b7f32f SHA-256: 9948d4bcfef906a007a975b0916afffc7e9abea1b7b5960082a34b69c80fe8bd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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://traffset.ru/123?utm_term=drop+dead+diva+ep+guide PDF link annotation
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/zediv.pdfIn PDF document text
    • https://pexazunawilaga.weebly.com/uploads/1/3/4/2/134265520/tajopupenuvun.pdfIn PDF document text
    • https://biwewijusegi.weebly.com/uploads/1/3/4/5/134586848/8390104.pdfIn PDF document text
    • https://redikuvemezu.weebly.com/uploads/1/3/4/8/134872152/bezejobamuxudujebe.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/lorewuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_5fa2d397d6deb.pdfIn PDF document text
    • https://fevuleniwawe.weebly.com/uploads/1/3/4/4/134476097/908808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5f99cf702c65a.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/48389a1b-3e2e-4a6f-bcfe-e8d2c344919d/96719610778.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/52972522200.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/nexur.pdfIn PDF document text
    • https://s3.amazonaws.com/radaruropivoje/1357210004.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/app_tracker_iphone.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_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 4976 bytes
SHA-256: fe0c718769f909ca7ae7f4c659e8a69eb09dfb13fc5469a43201d7e1701d26ec
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10796 bytes
SHA-256: 337c0c6b24dc6160e699b43d8f10ac58a6576c3da58130955b27702d79726348

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