Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d374d0a670f3d5a…

MALICIOUS

PDF

68.3 KB Created: 2020-12-26 06:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4908bae4d448766a937eaf771e9bd4f1 SHA-1: 215fd582db8a94fbe635b999e8f6073242d3fe88 SHA-256: 8d374d0a670f3d5a5f804aaa257fa781901bfb7cd8b6fd1f53a84b53b6f7724a
214 Risk Score

Malware Insights

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

This PDF file contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate a critical risk due to the presence of malicious redirector links and a link farm, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://gettraff.ru/strik?utm_term=dogfight+musical+script In PDF document text
    • https://cdn.sqhk.co/bivadudit/hbY1iiu/javusevejevijituf.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/fIGwxhg/98816791104.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/nonakenabuwi.pdfIn PDF document text
    • https://bufezemaz.weebly.com/uploads/1/3/4/7/134714495/5805513.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/Yloh6gh/business_games_pc_online_multiplayer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c5682d-9dd4-403c-9f0b-3ff56b1bb8db/37800526482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe90885-2619-4d53-b2d6-62512204d4ef/betemujirusaxedufideribob.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/95499843918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffda503-8bff-4540-8321-5f7f6f99a057/40976612100.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/89274191264.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/61816707002.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/bedepi.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_off0000ceb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB7 5428 bytes
SHA-256: ebbf29ecd85e181e0ceb6f7a3e341ad1a11d01ac0f8fa7277741d6d021e7dfa8
font_01_sfnt_off0000e113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE113 10568 bytes
SHA-256: 383272e759a7bc3dc492c7b535b989f33db6c6ba08c2a8236f2c37e50941d29d

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