Malicious PDF — malware analysis report

Static analysis result for SHA-256 61041d484a428e11…

MALICIOUS

PDF

82.6 KB Created: 2021-03-04 17:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f4be785a21dad91278d6d9efe0f1a105 SHA-1: 46dfe9f7b9d4a2643fce3f37b7211b52db6c5875 SHA-256: 61041d484a428e1106f1d53dfdfabd6697f8eabe80cab746cbd54e44acf6b9ae
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this conclusion.

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://dugedepap.ru/strik?utm_term=will+cyberpunk+be+fixed+on+ps4+pro PDF link annotation
    • https://cdn.sqhk.co/tulotunofuz/igtpjdA/xogeretekavemaw.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/ijl0hgH/9373839493.pdfIn PDF document text
    • https://cdn.sqhk.co/xakutofi/giEzjhw/86026602238.pdfIn PDF document text
    • http://proba7.xyz/jovabomujowamuzepopozdgayj.pdfIn PDF document text
    • https://gonedosi.weebly.com/uploads/1/3/4/7/134730609/vokogofavulenur_fenelegomi.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/327962100uqp5h.pdfIn PDF document text
    • https://fipakitifenilab.weebly.com/uploads/1/3/4/0/134042330/b2403080a9.pdfIn PDF document text
    • https://jerimokini.weebly.com/uploads/1/3/4/4/134484757/wavupifabidi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_f98119d2b291463b848ecb98998d280e.pdf?index=trueIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_71087e1c309a44e8b42916f1eccc68ca.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_a2495db03790450594d25ac608c6ec7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d48e24-6c0a-4c7e-8d10-2c5654e80017/world_stock_market_opening_time_in_ist.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_dd4614d30786498bbdee027fdd8a8d85.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_d8f3b01f3db34021aa932e4b6233680b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7818fa8-3feb-4add-b4f6-e4b0b0b76ad5/pelefibogorew.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_8f991b6c0b50411a9e9aad1eec3d180d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c55034c-18f7-4c76-b81e-c117649c9855/743179119.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/073fcb92-dd5c-491b-8648-a8759fbccedc/2879704290.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_3f358d78ce6349639e6af2e5e5742a1a.pdf?index=trueIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_64115e59ecf34a2e8c1d7dff3289d920.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_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 5416 bytes
SHA-256: 601c282d7ed514b222ded1e35fd48575052fe87bf377c823dc7bf7566cd07bb5
font_01_sfnt_off00011830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11830 10956 bytes
SHA-256: c9028bf5a16a01db26c9d9447b863e67a20a44a108cf18dd6f6121addcb56765