Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b24d188d9cd464…

MALICIOUS

PDF

86.7 KB Created: 2021-04-20 21:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4665ffa1b75cf9486bec94fa6a9a7bb0 SHA-1: c9ce0dfed33598037d06f0600cc6555a86aa3cf8 SHA-256: 74b24d188d9cd46466884f08f95f23019dbb56acc26800577863ac46e04adb9c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://mezovuduw.ru/strik?utm_term=how+to+use+enscape+in+sketchup+2020 PDF link annotation
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/51251d4c6.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/b09d6a4bcda.pdfIn PDF document text
    • http://uaregroup.com/50516821757s31tt.pdfIn PDF document text
    • http://avit0.pro/napowahgmr.pdfIn PDF document text
    • http://reduslim-official.website/60473420535clj4j.pdfIn PDF document text
    • http://wordsidepost.top/83365049105shgf4.pdfIn PDF document text
    • http://bowojimiwa.22web.org/xazopimibedafuvaparukoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fafebexa.epizy.com/15295399811.pdfIn PDF document text
    • http://jixosakotipol.epizy.com/sesozijidovusapuvidoxudij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752a29ef-7432-479d-a58e-0ef59b8aceb0/80602699932.pdfIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_919fd0277367418cbfbe6dc36a64830d.pdf?index=trueIn PDF document text
    • http://losexuzumobobe.epizy.com/80921409387.pdfIn PDF document text
    • http://wuwopuwanilepi.epizy.com/remington_1187_slug_gun_20_gauge.pdfIn PDF document text
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_62cf103083464bbabe46f3bad2699bfe.pdf?index=trueIn PDF document text
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_c57624b84ce646488448548d2b87edaa.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_9cb391cd1f7043a59f7c31f28e438a94.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/975b8359-498d-4a9f-af31-262437c6382d/bosch_1617evspk_wood_router_tool_combo_kit_review.pdfIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_cb2e55ac36b84d8a945d7aa35fa72f7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed29a230-2bd4-452d-85c3-3c68b6406ba7/solar_system_worksheet_answer_key.pdfIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_a63920b1222746aebf9d02d3bf990d01.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_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 5284 bytes
SHA-256: 560c6d1e0022c0f30b71bffd033919c00a5f8dc6f223c04cc0a106feaa1aed0e
font_01_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 18300 bytes
SHA-256: 121e9b0081d6518c9612d3a820aad077107127ac61132cdf1d57a722e2a2ea31

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