Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe9526547f35ceb…

MALICIOUS

PDF

73.1 KB Created: 2021-05-16 21:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 55c48c6dd40cc48d9a912178678b65d5 SHA-1: b70fdbed197835e4db86fe1423adf7801d0756af SHA-256: bfe9526547f35ceb69879869c7e5e41c4e03a47292443ae5ec9d30dfe6e47163
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly legitimate but disposable domains. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=ratios+rates+and+conversions+worksheet+pdf PDF link annotation
    • http://logunesunoj.medianewsonline.com/74663249345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471474/normal_60402b47e04d3.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/hiobPhg/64564845317.pdfIn PDF document text
    • http://fafijitesulexiz.mygamesonline.org/suwunugek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416143/normal_6066b6cc69bac.pdfIn PDF document text
    • http://tazizaj.iblogger.org/how_to_set_radio_station_on_pioneer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_605c624c4c16f.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/VoUajgi/5065529070.pdfIn PDF document text
    • https://cdn.sqhk.co/moxasapiwer/Hheghuj/finofipaxoxagaje.pdfIn PDF document text
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/7a6d8c48776c.pdfIn PDF document text
    • http://vuxiparami.22web.org/58914803489.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/godovezebugepaxuganuxipi.pdfIn PDF document text
    • http://tatewuf.iblogger.org/15569585618.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/antibiotics_resistance_2020.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/tefekoba-wemojinom-vozavabegegafaf-nomegumozejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_60353aea48abb.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://lalufelamuxijif.rf.gd/biochemistry_test_procedure.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/digital_electronics_textbook_free_download.pdfIn PDF document text
    • http://voxunerejowiz.epizy.com/ft-950_cat_control_software.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/canela_de_velho_florien.pdfIn PDF document text
    • http://molujafit.atwebpages.com/icao_annex_10_vol_iv.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_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 5220 bytes
SHA-256: 925f37970bb2fd2933609e932e2962fea47f7506d8905be41f4b708314033129
font_01_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 10548 bytes
SHA-256: 64f6b01ef17ac739877504616ab86168eae36bcea530637dc18dc629e0b0b170
font_02_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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