Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c861ac6e2cf160…

MALICIOUS

PDF

75.6 KB Created: 2021-01-14 23:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e78d93c49dc057628d4001a553550f09 SHA-1: 721c85c28daacfee3059ce7cfc03f9296289081f SHA-256: a7c861ac6e2cf1604629b3559ea9f8e56d98d62a5d3d5c4c80fe98a61f5c4b54
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The presence of numerous links pointing to disposable domains and redirector infrastructure strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 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://gettraff.ru/aws?utm_term=halo+premiere+bassinest+manual In PDF document text
    • https://site-1177725.mozfiles.com/files/1177725/zisigesufu.pdfIn PDF document text
    • https://cdn.sqhk.co/losegiro/hURjhig/king_of_bollywood_movie.pdfIn PDF document text
    • https://benefirezunaxo.weebly.com/uploads/1/3/4/8/134864331/firukoxapixejof.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/iitvXbk/gif_keyboard_by_tenor_apk.pdfIn PDF document text
    • https://koxiguxizabi.weebly.com/uploads/1/3/1/1/131163763/nezamigexaki.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/nalanusiweba-fuluku-guridiwegesuze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_5f96e749a54f1.pdfIn PDF document text
    • https://site-1168239.mozfiles.com/files/1168239/bricks_vs_balls_mod_apk_download.pdfIn PDF document text
    • https://site-1175435.mozfiles.com/files/1175435/general_contractor_contract_template_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ccda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDA 9908 bytes
SHA-256: ab9453504b387c4e8344aa3997490798956cdfb5a40b0ba9fd7c4dc75906b51a
font_01_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 5064 bytes
SHA-256: 891ef017afa3e75ca821df0f3208b22a216afc4b080369d45a5dd78981124d11
font_02_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 10076 bytes
SHA-256: 86f6677c17407362fa42c8e5511588906b39987c0a81733b12b1f3106a3c72d6

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