Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a731bb607d1b57a…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 07:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 941762ae8405856dea38f430c8da4e6e SHA-1: d9993e30f2abad65b3ea1d1ff245835c01578799 SHA-256: 9a731bb607d1b57a43e8f6721864b151c1360b03046cac3b84eb29b4e4bf649e
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are designed to redirect users to potentially malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://dafemum.ru/123?utm_term=free+sheet+music+flute+and+piano In PDF document text
    • http://my-favshoph.online/best_romance_of_the_three_kingdoms_game_pcv56e0.pdfIn PDF document text
    • http://gallery-shop.site/giveberoguvofuvirureg59wbp.pdfIn PDF document text
    • http://wordsidepost.top/ventajas_y_desventajas_de_modo_de_produccion_socialistajdhxb.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/YujNiid/reicast_dreamcast_emulator_pc.pdfIn PDF document text
    • http://reduslim-europa.site/android_resize_bitmap_matrix4l5of.pdfIn PDF document text
    • http://sexedate69.site/863850805742shz3.pdfIn PDF document text
    • http://kind-insta.site/zafovirovopoxab1teql.pdfIn PDF document text
    • http://begemotiks.space/guxunevetigufigd7d6q.pdfIn PDF document text
    • https://cdn.sqhk.co/zamikukodef/jzz5dqP/tonimurenokuzijifenewemos.pdfIn PDF document text
    • http://gonzo-3d.com/kemidetatepulikiwarifu4k20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_530548817c794c00bc3f77ca093c70f0.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_25149653c5054b5dabdd733151bc99c7.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_84889da978f349269a0456d8c813d0f1.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_c3a739600100403db1728eb752e060bf.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_4735aa5b9e98474d80a644493ed91f82.pdf?index=trueIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_b4dcf8d101cd4638984e34ff6aefb485.pdf?index=trueIn 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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 5352 bytes
SHA-256: 4f5f5934b15551de5b409463ed8c6d6cec8e9c5fc641a58ae4348251012ace83
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 10632 bytes
SHA-256: 871a948af1a861dce0db09f13053a0fe0f47034bec1052fce38448cee6a7ca5c

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