Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f758a4a4845b72a…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 00:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9c819618f8435ca4b2fc6d6a92eed5b2 SHA-1: 200fe396d3c01bdd92195d48f7b7083ffbd71649 SHA-256: 5f758a4a4845b72ae999b8da506b5608b83e8c50dc48cf57fcd0987e73268447
186 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 0.9997

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://jacksth.ru/wix?keyword=irobot+roomba+690+user+manual PDF link annotation
    • https://cdn.sqhk.co/benanejufa/71gg85J/lakebipitudebigomex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_5fe643bc400a7.pdfIn PDF document text
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/e28f10abab276.pdfIn PDF document text
    • https://wenajatimox.weebly.com/uploads/1/3/4/4/134480159/5abebf5eee1d.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/hcif7dT/one_gold_app_review.pdfIn PDF document text
    • https://goponubinolofuv.weebly.com/uploads/1/3/4/6/134695307/fenoguxinotare-gegire-pekininebupap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_6006c06f64e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492901/normal_5fd969cd3453b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470408/normal_5fca9cc97b163.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/gBEhija/84518164030.pdfIn PDF document text
    • https://cdn.sqhk.co/nudabesawi/bgd7jdP/56160577793.pdfIn PDF document text
    • https://cdn.sqhk.co/vozedolurezu/e6hjHji/hero_puzzle_mod_apk.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/lefemijip/excel_find_duplicates_in_multiple_sheets.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_6a70c6d13d1340cb99d1fcb2ca23f01b.pdf?index=trueIn PDF document text
    • http://tutazex.rf.gd/lolupuvetaraxa.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_f362c823ad1a4b819f1f9fc0682b6e99.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_8b9d591a2aa24d1d8a38e695e8b5cb24.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_212ad6a6ab664eeb8ada981918061c45.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemupajese/scientific_article_bibliography_format.pdfIn PDF document text
    • http://kelujatideligo.epizy.com/72241675275.pdfIn PDF document text
    • https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_0cba0391036b4a35b8fc4c05b984b56d.pdf?index=trueIn 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_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 5360 bytes
SHA-256: a1f42842ff6662b2b46e0bab7e4ff1263e4f270be3c990383aa3ba5b338a8b1b
font_01_sfnt_off00011706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11706 11208 bytes
SHA-256: 8d1364542bc1a488ad14631f9ebf46737e8df2eea24652b936e49e47ba2146a3

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