Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99da8c9678a94a9…

MALICIOUS

PDF

78.2 KB Created: 2021-03-06 21:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 48f913274838f05f11a3b016d8c065fa SHA-1: cd54c0ca16c3c45065af89cfdca0b6b632843885 SHA-256: a99da8c9678a94a9740024a6fedf08d8b0d1f37d5d233b6ff422493b31ea5e40
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a deliberate attempt to create a network of links. The embedded URL and the document body's reference to a broken appliance suggest a lure to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/strik?utm_term=panasonic+genius+prestige+microwave+stopped+working PDF link annotation
    • http://sigisuzuk.getenjoyment.net/how_long_to_cook_cubed_sweet_potatoes_in_crock_pot.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/aLzPvn1/value_proposition_canvas_template_powerpoint_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_6032292b1d2ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417818/normal_5fcc26a9cd6bc.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/4640153433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_60039200219f0.pdfIn PDF document text
    • https://cdn.sqhk.co/rukefureku/Fhhq1Cy/58235916525.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/hhjijik/vejoweb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_601387720a9c6.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/ePOMihX/pufoxamaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_3e62069b75e4472aa210ea3ffafd010e.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_e70ed17e2a8f473094c2fcff0dc8e4ba.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_c6bc27b052c24dca829e198fcdbb5ddd.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_7628e9f7ffad4276ba8e0a98ebd9970a.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_c1e066bfc1ac43a986b07b8b4048a21a.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_204dc6078cef45d2ba45f07900cae3b6.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_4821fb4a1e694748ab6bb06677d8eef4.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_7857c518bc164244aeab4c0da2936874.pdf?index=trueIn PDF document text
    • http://pekomuvave.myartsonline.com/how_to_use_a_craftsman_pressure_washer.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_916b0932245e44a193c1db93de20cc80.pdf?index=trueIn PDF document text
    • https://eec7825b-737a-4a76-8d7e-71a5c2c41e0e.filesusr.com/ugd/9b2d9b_b402bd16f03248cb8da9ee6a3b279b92.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_1313cbab0d54488faebe44cc84dc03a4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A0 5460 bytes
SHA-256: 00c933b7c981e0409c2b47f686eb73ecf940d00513de4f2f02e5a013253608e3
font_01_sfnt_off0000f92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92E 10488 bytes
SHA-256: 4245776689a5712d48d0531638e8fc46511f48cc26c0ea5580fc5cf3151060f5
font_02_sfnt_off00011d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D23 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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