Malicious PDF — malware analysis report

Static analysis result for SHA-256 8577968b583ca7f0…

MALICIOUS

PDF

92.1 KB Created: 2021-05-11 09:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 844c7b2479381cbfa0ff0620bf2a251a SHA-1: 87334e826ebd0bfc264e44519abb85920fd50db6 SHA-256: 8577968b583ca7f01036dfa0f53b7157e32dd49348bceda395e6fb48beec4951
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 0.9998

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=is+quiznos+healthy PDF link annotation
    • http://jurojegame.getenjoyment.net/beowulf_original_text.pdfIn PDF document text
    • http://montana-media.com/what_crop_has_the_most_calories_per_acrejnp40.pdfIn PDF document text
    • http://xozonline.ru/cadillacs_dinosaurs_apk_direct6m9kx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447658/normal_60358507cf9cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_602271fda29b1.pdfIn PDF document text
    • https://wexikapej.weebly.com/uploads/1/3/0/8/130874413/e019d75795e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465935/normal_60484309b5917.pdfIn PDF document text
    • https://bugagage.weebly.com/uploads/1/3/5/3/135330359/7568203.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/94985886843.pdfIn PDF document text
    • http://tuvosudokalidu.scienceontheweb.net/84603198579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497348/normal_5fcd60f144244.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_4434d7e9b15b442bbda4e21d3178f889.pdf?index=trueIn PDF document text
    • http://wudemexa.myartsonline.com/markstrat_report.pdfIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_bd13ce3603fd47078995dc3394986b67.pdf?index=trueIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_dd61e9ca976544439e248cb30e2381c0.pdf?index=trueIn PDF document text
    • http://bivojeda.atwebpages.com/76348588655.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/joladalanomowejufabiluvom.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_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 4892 bytes
SHA-256: ce1b474cbfca20b5347bc75548e06214b4fc88927ddabf4066bc94414d0a3f82
font_01_sfnt_off00013b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B98 11816 bytes
SHA-256: 4903bce94ad8d77060712fdaee06b4bae04621c50c51d45bc30197665539f215

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