Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad4e8ed9bb8ed47…

MALICIOUS

PDF

69.1 KB Created: 2021-01-18 02:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e76efdade6e0857107e03f0438880d8d SHA-1: 49c5c35eaadd4a87a6ad248ca0bc74fb868a3401 SHA-256: fad4e8ed9bb8ed4793b09d52f83dd5af5f0158ee812b1d8d837b010d6285b43f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, a common tactic for distributing malicious content or conducting phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious sites. While no scripts were explicitly extracted, the presence of numerous external URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/123?utm_term=a+modest+proposal+questions+on+rhetoric+and+style+answers PDF link annotation
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/3260354.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/TjegeNI/samsung_notes_add_on_error_message.pdfIn PDF document text
    • https://xesinuvukuwufo.weebly.com/uploads/1/3/0/7/130776104/294cb8fff2ecd.pdfIn PDF document text
    • https://wezinifagewugi.weebly.com/uploads/1/3/2/8/132815004/waludedido.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fc8c104cde6a.pdfIn PDF document text
    • https://zetizisoxaw.weebly.com/uploads/1/3/4/4/134498522/f7fdaccd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497658/normal_5fe933a17410b.pdfIn PDF document text
    • https://pivozedotafi.weebly.com/uploads/1/3/1/0/131070355/177646.pdfIn PDF document text
    • https://pogiwaxo.weebly.com/uploads/1/3/5/3/135312355/bolaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5fcf28e4ef24d.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxawexa/biejfjQ/68651880567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5fb601498ddd7.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/mirajafutori_xerasefezivuf_bawojag_sijaguki.pdfIn PDF document text
    • https://pigijolewafa.weebly.com/uploads/1/3/4/2/134235355/senopiziz_tokejotexi_kabimelovime_zesodatejebiv.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/01858ab.pdfIn PDF document text
    • https://jekunido.weebly.com/uploads/1/3/4/3/134312583/kerefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD166 5624 bytes
SHA-256: 93071e6503634436a8160daf8fcf5b45e7bfaa7b28cbb377462ac35ac6753ae8
font_01_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 9984 bytes
SHA-256: b6ddd936bd9c34412af1f3c8bd889a4d3787b7e3f27fd969bdb9c8fe4adac85b

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