Malicious PDF — malware analysis report

Static analysis result for SHA-256 345cebdf81507abf…

MALICIOUS

PDF

73.6 KB Created: 2021-02-21 23:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9a43dad506ddd79c09dd42a2253c94bc SHA-1: 5e90f40a87d252d3183e4d252f0598578f14374a SHA-256: 345cebdf81507abf0e8ff242eb3dbf4e73b0dbfd291355deedaa4f863222f5ca
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting an SEO spam or link farm tactic to redirect users to potentially malicious sites. The document body, though heavily obfuscated, appears to contain search query-like text, reinforcing the lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=how+to+connect+vizio+soundbar+to+tv+bluetooth PDF link annotation
    • https://cdn.sqhk.co/kazaluxi/ia30qhc/black_friday_2020_amazon_kindle.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/lQgfuhf/raza_blanca_meaning_in_english.pdfIn PDF document text
    • https://gomadiwisedewun.weebly.com/uploads/1/3/5/3/135314557/3636245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473064/normal_5fec845bda44b.pdfIn PDF document text
    • https://cdn.sqhk.co/sexuzoropa/jehb8he/pogivekilebo.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/ezrjb1w/subaru_rally_car_tires.pdfIn PDF document text
    • https://cdn.sqhk.co/xakurusuk/ijhdjaR/12200514232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_602709e4c953b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5fe8df40985dc.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/gha5Hji/72436846609.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465537/normal_5ff8c41a2ade4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_60263932ae4e9.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/gdjix4X/tepatotibekilabunebak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_6017fd78cabd7.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/iegeijQ/assembly_line_for_sale.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/xipasukuribudonavin.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/2628453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 5328 bytes
SHA-256: a7e294430bb44ba9cbefe594ca5967c6437f624e8677d4e86445c0e3c8b7e137
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 11056 bytes
SHA-256: a60681d26769d72005659e1226c20bf4bbf6316ab2598a3cbd32db2a928dd8f6

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