Malicious PDF — malware analysis report

Static analysis result for SHA-256 798954af8de015a7…

MALICIOUS

PDF

75.2 KB Created: 2021-02-13 07:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 25ceded078f8b65067609dde64b94e0c SHA-1: 98976398438eab3a85a7e88c4b3a44fe44d6cd4f SHA-256: 798954af8de015a74b56eb9ff2b149b69239b15a5406151c467f4d55855da1fb
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wb?keyword=arduino%20uno%20filetype%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375890/normal_5ffb89452cfcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421213/normal_6023da983d443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_60226986ae6d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393502/normal_5fedbcd0a785c.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/ggEzMgf/baby_potty_training_seat_target.pdfIn PDF document text
    • http://wazasutosas.iblogger.org/37635876203.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/aibTmGM/xevumasimudegukufen.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/bWrgeZz/horizon_blue_cross_blue_shield_employee_directory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_5fda782c3e74f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5fc91e3ae7482.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://kowisefofob.epizy.com/lizovovefalafekifepaxeno.pdfIn PDF document text
    • http://menenig.rf.gd/23484987347.pdfIn PDF document text
    • http://gewumene.epizy.com/ampullary_adenoma_guidelines.pdfIn PDF document text
    • http://dirojuriju.epizy.com/2d_shapes_worksheets_for_2nd_grade.pdfIn PDF document text
    • http://kapekoguxepo.rf.gd/alien_shooter_2_mod_android_1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 4620 bytes
SHA-256: 6879b457b5c579e274cc5a63d3c229a99b39c15fc9056f19af283677e617bebc
font_01_sfnt_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 10652 bytes
SHA-256: 379f76aa4349ca9fb267f81da8465948d343eeb1b66df7b83695b670083b8294
font_02_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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