Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23341a1a41d0cd4…

MALICIOUS

PDF

63.6 KB Created: 2020-11-24 20:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b8b1247c4217d200d6527ec1a01b201d SHA-1: 72b521ef4be98c921b2c1b87a3eb42dbc64eaa94 SHA-256: d23341a1a41d0cd42372155bb3cb6ffb7341cb9c427bf5eb1a3443019b233dc7
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded links, such as 'https://gettraff.ru/123?utm_term=cite+dsm+5+apa+in+text', are likely intended to lead users to phishing or malware distribution sites. The presence of numerous links suggests an attempt to obscure the true malicious destination and potentially leverage SEO techniques for broader reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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/123?utm_term=cite+dsm+5+apa+in+text In PDF document text
    • https://xigepeseforala.weebly.com/uploads/1/3/4/5/134508125/fadubovefakogog_fafofimijulit_vebekaruf_muvuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5f8f3b37b91ee.pdfIn PDF document text
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/nuduzuvel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_5f927f1259c44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/vipuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1614b435-2a60-4236-8a39-2ebd4ed10c78/lady_of_the_lake_andrzej_sapkowski.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f622b6-89d6-4027-836e-cf63526b51dd/sonic_mania_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14b80cb-4809-4681-9139-356cafc1d2ac/flexible_electronics_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba634c99-b0d0-40f2-b0e9-0362f1748e2b/59034170705.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_off0000bc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7F 5076 bytes
SHA-256: 03ca5a4b1f51523d245c13a1c50c3cf36776c7d35a475a7926759ed706e98cd9
font_01_sfnt_off0000cdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 10932 bytes
SHA-256: f57dd9e73c8fb4eac9e5fc9bbab92fa6283dbff212504dd0f59795ec1b6a7829

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