Malicious PDF — malware analysis report

Static analysis result for SHA-256 335deca1b47cf74b…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 15:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a2a3b6dff06daee9910103245431ccd SHA-1: a78c3a2c4addf3dd5382e25909efed2e59a0f2ea SHA-256: 335deca1b47cf74b97b82e035924d7c9eb3b03f250f95f381086f700df97f4e9
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting services, suggesting it functions as a link farm to distribute phishing or malware. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/award?keyword=eaton+13+speed+transmission+fluid+capacity PDF link annotation
    • https://cdn.sqhk.co/badaxiloru/yhasvBf/nuzijevawefaxad.pdfIn PDF document text
    • https://joripipebepif.weebly.com/uploads/1/3/4/1/134131856/015ba6891a2.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/2iiTTia/funamadozikitebolipizipag.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/b64b67c8a0.pdfIn PDF document text
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/ditomasiropojowis.pdfIn PDF document text
    • https://cdn.sqhk.co/baxikomo/PhjMUjj/52613011031.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/gi3RgfS/95806181523.pdfIn PDF document text
    • https://cdn.sqhk.co/towojutal/bibzg09/yeetus_the_fetus_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/ib4hflO/75409745081.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/explain_the_meaning_and_scope_of_public_administration.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewuwuja.onlinewebshop.net/rusajozurijojawizoxe.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/the_constitution_of_liberty_hayek_summary.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/zaguneb.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/allen_carr_stop_smoking_free_audio_download.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_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 5576 bytes
SHA-256: ca8ca539a13622d227dbf52a282cdd38211674170e1bc069a4a0495800005c7d
font_01_sfnt_off0000f651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 10336 bytes
SHA-256: 67e0c849c680a8e8094810039b6b78d0e4c2754ef4c3ceb2611edb85d054def3

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