Malicious PDF — malware analysis report

Static analysis result for SHA-256 b540e66c67f6977a…

MALICIOUS

PDF

89.9 KB Created: 2021-04-22 10:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9c25bdef27be5042fe726361ccb6d67a SHA-1: 5568223cf093b3a255a5c883363b6aae22f02a1c SHA-256: b540e66c67f6977adbd3e409ab6a77874f840b2a5f4bf8a12cf4c02c84eb6971
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting a link farm or redirection scheme to malicious sites. The document body, though heavily obfuscated, contains keywords related to error codes and drivers, aligning with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=neopost+is-200+series+error+codes PDF link annotation
    • https://cdn.sqhk.co/dokederajo/hblqzy6/amd_a55_chipset_driver.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/e50813244fc75e.pdfIn PDF document text
    • http://reawont.online/78481453817sqz54.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/9eifhfx/playroom_organization_hacks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_60113be3c0521.pdfIn PDF document text
    • http://triple-doska5.club/201153844274r13z.pdfIn PDF document text
    • http://floradoma.net/what_are_the_three_types_of_rhetoric_in_englisht8a8d.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/jiiaW8I/61413118469.pdfIn PDF document text
    • http://dalnoboyi.xyz/top_coffee_quotes8dqkq.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/iodine_value_experiment.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/EhhheB5/66193102985.pdfIn PDF document text
    • https://cdn.sqhk.co/budufunewuf/4jjhrsY/yahoo_mail_restore_form.pdfIn PDF document text
    • https://kalozepi.weebly.com/uploads/1/3/0/8/130814360/telemubared.pdfIn PDF document text
    • http://gayerkan.com/java_game_programmingtxuai.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/vancomycin_resistant_enterococcus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375889/normal_6034543273233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_6062523789f81.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/esophagus_cancer_nccn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfd61e6-2a88-4a62-a6aa-22f8f145c8ef/carrier_apu_wont_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/111adced-7ae8-4429-bf7d-eca7a4ae25ab/free_xbox_360_live_codes_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c89d51b-64d0-4343-99c6-62d2edfefd18/77982115804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e434597-01ac-417a-bfa7-aeea16ad9ac1/dewexovum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fd613f-8f05-4272-abe0-c17771bf2fe6/understanding_by_design_lesson_plan_for_history.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_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 5100 bytes
SHA-256: 10edabc4856eea7bd60e87bb8450bfe22f77561a53124aa66a71ed301dd935ce
font_01_sfnt_off000133c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C1 11124 bytes
SHA-256: fc50d5744c080d1c9cf1ab8749de5592201b855befd3094fea3dfcfd9c619732

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