Malicious PDF — malware analysis report

Static analysis result for SHA-256 253aeac37990f5f7…

MALICIOUS

PDF

122.3 KB Created: 2020-12-28 18:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 994f9731cd95fa27a4b8178f2a6923da SHA-1: 684ad09dcab89d0f928dd9f60930126703a56754 SHA-256: 253aeac37990f5f784ba9f2817531c241b627f67b8a7399169d55db51e4d2cef
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'traffmen.ru'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, including one to 's3.amazonaws.com'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=esmo+guidelines+lung+cancer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5fb546301f236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_5fbff79f8bef6.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/5372810.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/gI10hbn/bogazile.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/hf9jjhc/metronome_drum_machine_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f886a25e2187.pdfIn PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/zajededexe_bevakosuzuw_jozidi_rovazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5fe8994494ebd.pdfIn PDF document text
    • https://cdn.sqhk.co/wojinagimepu/gdHRNeW/surge_2_train_control_room.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_5fa5b09d7144a.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/jiwisi/uddos_lentil_pasta_recipe.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/70564344288.pdfIn PDF document text
    • https://medlineplus.gov/lungcancer.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a92d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A92D 29616 bytes
SHA-256: 881a8adda9e904db7d21c52769934ecc631c08c5a3239b679d6f4aa428a5348b
font_00_sfnt_off0001716d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1716D 5216 bytes
SHA-256: 760c45fdb1d59d32000b4fdab00feb09a2532b7facf014766a97993347551c43
font_01_sfnt_off00018312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18312 11276 bytes
SHA-256: 9838568762469f20cbac40b3892fbe14fca744fa02a341c5a1fc4dd9a0a099db

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