Malicious PDF — malware analysis report

Static analysis result for SHA-256 979ce84631755fbe…

MALICIOUS

PDF

94.0 KB Created: 2021-03-01 23:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 902278b44aabbe148e367bbfd41e7674 SHA-1: eeda7b3b7174e421dd05fa55ffee099d1461fae1 SHA-256: 979ce84631755fbe652388e135b7392b2d9db879ebe740e3ecf5d704c06f14a8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://jacksth.ru/strik?utm_term=the+mortal+instruments+city+of+bones+full+movie+cast PDF link annotation
    • https://cdn.sqhk.co/vozeseseber/igicjiL/tinkler_meaning_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/hbZ0hie/strategic_human_resource_management_an_international_perspective.pdfIn PDF document text
    • https://cdn.sqhk.co/takoxuwal/Gi3gfjj/mepezitufisozexirugi.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/fhajdha/53773865518.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/609405.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/leloxalawux.pdfIn PDF document text
    • https://pusixeraz.weebly.com/uploads/1/3/2/6/132681440/gixoroka.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/kjijjjf/goat_simulator_xbox_one_multiplayer.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/f3e18c2cfdfa41.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/3uhhMjg/tuberculosis_definition_biology.pdfIn PDF document text
    • http://taygerr.com/aquatic_adaptation_in_birds_and_mammalsxsf36.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/5DGlyan/bronze_age_chronology_in_the_carpathian_basin.pdfIn PDF document text
    • http://easterthjg.com/2246618358e46od.pdfIn PDF document text
    • http://liketime.online/nebulous._io_mod_apk_2020rlq9m.pdfIn PDF document text
    • https://zuxosudeti.weebly.com/uploads/1/3/4/3/134359900/4757ddf.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
    • 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_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 5256 bytes
SHA-256: d285592a71a7ebda35adfb799a056ca954fe309f96a806935f325487db7b8e73
font_01_sfnt_off000133dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 12028 bytes
SHA-256: 48c6be3f3f519131a93a4187b9d04c7875265d72de1ff42a2bb49cd9c802992b
font_02_sfnt_off00015c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C44 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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