Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe76e3f788ae8ed9…

MALICIOUS

PDF

82.6 KB Created: 2021-02-24 03:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7237195f29edc0e9ea86d1c7ed546d62 SHA-1: 5320cec9eb7dc5f557e234dacdfb6081c1edb302 SHA-256: fe76e3f788ae8ed984485a9a393d22b0d5f7f18c86770d313fc6dfe1b26676de
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-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://druttle.ru/wix?keyword=war+thunder+guided+bombs PDF link annotation
    • https://kuvolobogon.weebly.com/uploads/1/3/4/0/134012650/5538765.pdfIn PDF document text
    • https://kuxapularutamux.weebly.com/uploads/1/3/5/9/135984678/jolomavuzibewad.pdfIn PDF document text
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/pizifaderitoxure.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/susuwinokurox_jalumajebawim_fixedalu_javasalinefumog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470825/normal_600e8792284e0.pdfIn PDF document text
    • https://bipufufutugudov.weebly.com/uploads/1/3/1/1/131164095/6647377.pdfIn PDF document text
    • http://prizinsta24.online/87567702815szctp.pdfIn PDF document text
    • http://seamanygau.best/winny_earn_cash_moneykrzev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_6025471d6abc3.pdfIn PDF document text
    • https://kepefiporewe.weebly.com/uploads/1/3/4/7/134704647/079d013b0cdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_6023bf80063a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_6033c4f897c55.pdfIn PDF document text
    • https://fudopelotavag.weebly.com/uploads/1/3/5/3/135325828/xidux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_60274528680bb.pdfIn PDF document text
    • http://freefire-gifts.com/router_setup_page_apk_openpaydy.pdfIn PDF document text
    • http://lg-supportteam.com/4305640309930y8o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_60253a3781b16.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/nevowimo/homogeneous_catalysis_mechanism.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_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 5360 bytes
SHA-256: ed0e4f1275e986fe043d05ecce74b7a74544d76df7974d5a4455b5a038ba001d
font_01_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 10292 bytes
SHA-256: cbf866eabb6532d208a6c6f62c772cb41f4b03a623d77e45c015e0252482d24f

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