Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd3dca10b8a775a…

MALICIOUS

PDF

105.0 KB Created: 2021-03-15 15:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5c37d8171723f304c198c31ccc4ccb40 SHA-1: e9cf2e850a5cc0864a49053f0abc8655b6e7d26a SHA-256: efd3dca10b8a775a4856dc6de3f4686e1155dd7c22fe7f609ab8992c01fbc950
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=small+thin+sheet+metal+laser+cutting+machines PDF link annotation
    • http://kieverts.xyz/28506813841dv91k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388614/normal_5ff17a451f0e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389603/normal_5fde131450454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_5fd672676a070.pdfIn PDF document text
    • http://segwaywheelchair.ru/53700864137d0d7d.pdfIn PDF document text
    • https://nufusuninad.weebly.com/uploads/1/3/4/6/134609023/peguzubowowi.pdfIn PDF document text
    • https://tubozabuzimez.weebly.com/uploads/1/3/4/8/134878922/niborawoxa.pdfIn PDF document text
    • http://ig-about.net/gupebiduwemipaguwuvusasuwojb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445325/normal_5ff8dd17d1ad4.pdfIn PDF document text
    • https://megigoxifiwovom.weebly.com/uploads/1/3/0/7/130740625/jiwexigizuzura.pdfIn PDF document text
    • https://sowodelomix.weebly.com/uploads/1/3/5/3/135315299/5087079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_6024ba26ecd29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461484/normal_5fc9778a4d0ad.pdfIn PDF document text
    • http://tazizaj.iblogger.org/54075005327.pdfIn PDF document text
    • https://soxapibojewaw.weebly.com/uploads/1/3/5/3/135345372/8412857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5fe5037a3913d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zafirawit/numerical_expression_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/cookbook_template_for_word.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/bemekigazijajezamewabod.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/can_you_audible_books_to_ipad.pdfIn PDF document text
    • http://fojoxolizono.rf.gd/babylon_berlin_schweiz.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/jorujuxomidifoletes.pdfIn PDF document text
    • http://radujexoxetapil.epizy.com/cain_and_abel_link.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_off00015d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D43 5316 bytes
SHA-256: 148c541d31bb06c32cf1bbdcbbfb5ceeedcb083a8334139aa84312c206064eb3
font_01_sfnt_off00016f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F1E 11420 bytes
SHA-256: 4d103e0c909bfaddccdebcfc7922dcfe0230fef763f9b2a5f22d2b8ad78330f8

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