Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19f413f2f846eaa…

MALICIOUS

PDF

74.8 KB Created: 2021-03-27 15:49:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a49892d909b8d5af064d9e9af3569bae SHA-1: cb6358973301305e825db1d68420a103cc009f9a SHA-256: e19f413f2f846eaa2a795841a2f21862ea9f51873356dbc74d6efd47bf2c88fb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://mezovuduw.ru/123, is likely part of this malicious infrastructure. No scripts were extracted, but the PDF structure and heuristics indicate a malicious intent to redirect users to potentially harmful sites.

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
  • 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://mezovuduw.ru/123?utm_term=literature+survey+meaning+in+project+report PDF link annotation
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/mezifebu-denajus-ruzepogu.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/4536496.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/O2hjXgj/change_color_outlook_app_ios.pdfIn PDF document text
    • https://nekusudowup.weebly.com/uploads/1/3/5/3/135315851/posimumorigexevuxus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_5fd1a38f4eabe.pdfIn PDF document text
    • https://rapironid.weebly.com/uploads/1/3/1/3/131398378/56380.pdfIn PDF document text
    • https://cdn.sqhk.co/venebavor/1d6ie7k/88331463097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_6028fb039d479.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/aicCge9/sentencing_council_guidelines_arson.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_ae7e49482ce54d54bdaa8535c91bc7d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba73801-1389-4fa5-947d-eba6923901e0/why_does_my_shark_cordless_vacuum_keep_cutting_out.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_2ac47ff9629342e5b87481b29b95deca.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_1cfdda9330f546a3b7c74e4cd516213e.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_47bbf1b9630d48f98424936f2ac86927.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b4dcc72-2454-47f2-80bf-fcffa96c8937/tesufugaregisunol.pdfIn PDF document text
    • https://849bdae7-2456-4570-9e2a-fc769e7e49ad.filesusr.com/ugd/2074c9_ecf7b78e1a0649f3b47d8255e82ca9c9.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_4702993ad1c0445c8c1fa416857659d2.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_457fff4aca6a4749a5fd95c0160a7124.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e18601-451f-4dd5-a249-a77f35538a01/adobe_photoshop_cs5_full_version_free_download_with_crack_for_windows_10.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_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 5400 bytes
SHA-256: 073131acc228815893c6c8988a1b8076ebfcab639aba24f89c285a61f5f99edb
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 11220 bytes
SHA-256: e9015ed8c40f6b45f66f28152602d9716f7f71da2c1e0f11276ba66ecbefb5f3