Malicious PDF — malware analysis report

Static analysis result for SHA-256 76edfbc17d155539…

MALICIOUS

PDF

68.8 KB Created: 2021-02-16 12:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3a0050617fdc61ecfd55a739e3649502 SHA-1: 4e03a1629bd2a7eff600e9a16dbbf8faa3607451 SHA-256: 76edfbc17d155539fdc52863aae0f46eeeff3a9010d04912a093e61e31a03c2f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

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
  • 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://crophysi.ru/wb?keyword=what%20do%20u%20understand%20by%20interest%20groups In PDF document text
    • http://all-gopro.com/what_is_the_price_of_royal_enfield_standard_350796oz.pdfIn PDF document text
    • http://xrootunited.com/aureus_primary_school_uniformf3ith.pdfIn PDF document text
    • http://lightly.store/wenazuvubaqg8q5.pdfIn PDF document text
    • http://trenketo.buzz/toshiba_battery_driver7hqtp.pdfIn PDF document text
    • http://aazzzry.space/bujetaguum1kc.pdfIn PDF document text
    • http://osthondroz.com/13146909219babrt.pdfIn PDF document text
    • http://curvepreloved.com/tenifibaruqjmzi.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/icAihig/fumigojifozozopozirazavi.pdfIn PDF document text
    • http://albl.ru/71803703204lvt8d.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/dgevhaK/my_little_princess_stores_apk.pdfIn PDF document text
    • http://haustova.com/area_and_perimeter_anchor_chartuopc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilulew.rf.gd/vatebas.pdfIn PDF document text
    • http://xuxerikafirin.epizy.com/79841096230.pdfIn PDF document text
    • http://mezexefobotero.epizy.com/govupulizujud.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_off0000ced1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED1 5444 bytes
SHA-256: f4b7c58a6e5d89242ff5a776567b0757350e0500797029a1505f73aac21f8a32
font_01_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 10800 bytes
SHA-256: f804b8832159f9416be59ed7069a2f291c208ccfc095b55878a1d7c206342dba

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