Malicious PDF — malware analysis report

Static analysis result for SHA-256 13464bf4b0e1f11b…

MALICIOUS

PDF

135.1 KB Created: 2021-02-21 00:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 099556196244ab6f27539130dd351984 SHA-1: 5f545783d891560d17a91bb3b2ad151ffa291fbe SHA-256: 13464bf4b0e1f11ba734050acfaaeba8bb46122db8cd6bf3d0a43a8aae2ddc29
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure the user to a malicious site, likely for phishing or to download further malware.

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=will+there+be+a+season+2+of+demon+slayer+after+the+movie In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_601dfc96bbfd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5fd18e10a8e32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_602d1cf5e0120.pdfIn PDF document text
    • https://cdn.sqhk.co/tokokoxisuf/hjhjheD/graphic_design_blogs.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/7iiGPjf/train_sim_world_2020_ps4_review.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/hdighja/16218966819.pdfIn PDF document text
    • http://jozulizip.iblogger.org/givunit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495988/normal_6004741c36f43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463526/normal_6004c0b5e68fc.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/bbgcmjj/jemokaloxekunupog.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/32RmhAT/luvuguropipewuximidabufo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://virujafaxamer.epizy.com/how_does_weekend_jail_time_work.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/hssc_clerk_answer_key_22_sep_evening.pdfIn PDF document text
    • http://dufemeg.epizy.com/85454291801.pdfIn PDF document text
    • http://mewokusexet.epizy.com/vuliko.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/diameter_of_a_circle_worksheet.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_off0001d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3EC 5596 bytes
SHA-256: 393185c2fcc944efa3e8e562ee86d88f95c90facc41738d87e73b7dc6d19d7c7
font_01_sfnt_off0001e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6D9 11820 bytes
SHA-256: 4c5c28c91b1db6d7f4f1732e9d3a41af884f34f52b1d4efd6c99e0b1bf4345bf

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