Malicious PDF — malware analysis report

Static analysis result for SHA-256 075434cb913e5044…

MALICIOUS

PDF

80.5 KB Created: 2021-04-03 07:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2ea9f76275fba5554a4c64c531edb87d SHA-1: 2d625eee78c8b270904005f60303f0ce8ca03120 SHA-256: 075434cb913e5044ece5d823ddf8ba751adbe4c75b79df3675ee495756859316
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many of which point to other PDF documents hosted on disposable or SEO-focused domains. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to manipulate search engine results or distribute further malicious content. The presence of external URIs and the overall structure align with techniques used for initial access via phishing and potentially exploiting client vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://botokaw.ru/123?utm_term=battle+chasers+nightwar+game+guide PDF link annotation
    • http://gbarb.me/acuto_formal_shoesbla4p.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/0gcghc4/likigabusebeli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_60316d3fc7093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495257/normal_60078e0e0a563.pdfIn PDF document text
    • http://afterdealer.pro/diy_glider_simulator_cockpit2d6e6.pdfIn PDF document text
    • http://mnogolidov.xyz/human_life_international_ireland3r67b.pdfIn PDF document text
    • http://copyrighthelpcentral.com/799582310988ctr5.pdfIn PDF document text
    • http://levantegroup.net/56925649400w99fq.pdfIn PDF document text
    • http://good-production17.site/nonlinear_dynamics_and_chaos_2nd_edition_solutionskb5h6.pdfIn PDF document text
    • http://mobile-media.moscow/control_my_panasonic_tv_with_my_phoneonrcu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_6003896fc084a.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/ijieghd/8637231775.pdfIn PDF document text
    • http://mabay.fun/widinezosib3p7zb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_efbf27be0ad14194aa466721124f3eda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e13fa5-7558-42a0-842c-b9709c77d4e2/gegizelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b89a221-1448-4840-a688-2367aba296d7/12804504994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c0cab1-dbd1-4b26-9e13-3c6a19c8247c/ragilidukekomikiwinuxizim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff62546-5086-4343-a2cf-1f07d93096fc/how_to_uninstall_audio_drivers.pdfIn PDF document text
    • https://662517ce-f374-4037-aebd-99b1dbe00103.filesusr.com/ugd/0c4177_5717e35508964a99829e808a4a732608.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_2069dc7098bb447d84eec33079940175.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c290c81a-c4c2-4054-86ed-90eca9b41dfa/vixodokinurofukapav.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_8c6ef91d88a84bf68975dcbbbef9a24b.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_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 5496 bytes
SHA-256: ab991dd8836edf05f50d90081715548cfb4886f4191c5a49d6b8046ec3b61c3f
font_01_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 11004 bytes
SHA-256: 57c8b700284d36f9b58803753f6741286b4464c918ae4aa3d18cb70c5ae61e8c