Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ec1ccca01f8a5a…

MALICIOUS

PDF

70.5 KB Created: 2021-02-23 11:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 482346b8f1dba406e46228df93d688ab SHA-1: b9c824c7c8a537f329bfb86f82be0ef940a2a9aa SHA-256: 38ec1ccca01f8a5adf161ee85b40731b1befa3ed2dc05b77d5432dedd9977491
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The primary redirector URL is identified as malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://yafferge.ru/wix?keyword=krwg+tv+schedule+las+cruces In PDF document text
    • https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/dbc05ff78.pdfIn PDF document text
    • https://mubelumovetofap.weebly.com/uploads/1/3/1/8/131856402/e04c0f7c9.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/7a5fc.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/6347535.pdfIn PDF document text
    • https://cdn.sqhk.co/safovokon/ejegjPY/chess_local_multiplayer_android.pdfIn PDF document text
    • https://dopilefuma.weebly.com/uploads/1/3/4/7/134733068/ba579fdab2.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwezomu/v03hahf/koniferaxenubofopa.pdfIn PDF document text
    • https://lurusavi.weebly.com/uploads/1/3/2/7/132710630/56efc59eec36919.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/fc31c6d6391c0.pdfIn PDF document text
    • https://fejuzewe.weebly.com/uploads/1/3/4/8/134883228/6705111.pdfIn PDF document text
    • http://promooffer.site/voditedajo36c4f.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/hdHlhez/limit_screen_time_on_android_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/i0unFij/gunship_iii_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/gesufe.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/synthesizer_roland_juno_d.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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 5324 bytes
SHA-256: bdf7d0a435b65c2ad8a1370e2822c8944ccee950de44a6f13ebb6041086600ba
font_01_sfnt_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 10240 bytes
SHA-256: 5a8d58462b0b7bba1bd6ab7976328e791e4f3b49354d63e7ba2e3e5a72c410cc

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