Malicious PDF — malware analysis report

Static analysis result for SHA-256 465bf0888a3a5be6…

MALICIOUS

PDF

78.6 KB Created: 2021-04-10 11:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f02d66488f090b57a7950d6162d91a1d SHA-1: f0491632204516611285c7cbf0d85d85e9e13cf4 SHA-256: 465bf0888a3a5be69e376e9036164c6662627335fe55843d62ade0a2bdddf62f
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, with at least one pointing to a known malicious redirector infrastructure at 'https://yafferge.ru/strik?utm_term=what+are+the+protocols+in+tcp%252Fip'. The presence of many links on disposable hosting suggests a link farm designed to obscure the final destination, likely a phishing page or malware download site. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+are+the+protocols+in+tcp%252Fip In PDF document text
    • https://cdn.sqhk.co/devisofage/aggiaUf/tarala.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwexosul/Byn4wja/14680257783.pdfIn PDF document text
    • https://dizusama.weebly.com/uploads/1/3/4/7/134730201/vivelumarije.pdfIn PDF document text
    • http://groshyk.site/4420558627410mf0.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/9281e8cf0.pdfIn PDF document text
    • http://shlifovka-pol.website/wavebaxomupitz8m6k.pdfIn PDF document text
    • https://joxobupapi.weebly.com/uploads/1/3/1/4/131454586/2220314.pdfIn PDF document text
    • http://golulim.iblogger.org/zoliv.pdfIn PDF document text
    • http://startask.ru/oreck_airvantage_air_purifier_filter_replacementy5pz8.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/2316007.pdfIn PDF document text
    • http://laxana.ru/lokidedukx171.pdfIn PDF document text
    • https://butoxuxesadi.weebly.com/uploads/1/3/4/6/134699311/3318706.pdfIn PDF document text
    • https://cdn.sqhk.co/jubelupubex/c0Yjfvo/tiwada.pdfIn PDF document text
    • http://cheatyou.site/john_deere_320_skid_steer6zci2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufabilo.rf.gd/73183204726.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_a6b442bcc84d460aae72f5ba814c36ca.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_46472ebb296a4c5097e4a5a7d6b7a613.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_66f2731dcc294ebea364cf20ef626aba.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_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 5072 bytes
SHA-256: d39f8e062edd448f2c98a008567f81e3b719bd81dcd89d337a62514d92c8d17b
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 10172 bytes
SHA-256: d9b7fa4fe4ab110ddb4b2d60b8e7736d64ead0a49790632c3681a727c582c865

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