Malicious PDF — malware analysis report

Static analysis result for SHA-256 650acd59c037c490…

MALICIOUS

PDF

85.4 KB Created: 2021-04-06 06:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1a5088ca6da476ebb3d47f50311abb99 SHA-1: 231c1133e47f9ae0b5495eaf4b52f5667c9e9917 SHA-256: 650acd59c037c490dab8963a51e68286cc962102e1e4d316c67186648d87a831
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/strik?utm_term=how+long+does+it+take+for+cobra+walkie+talkies+to+charge PDF link annotation
    • http://ostanni.fun/what_type_of_heater_is_best_for_a_garage4szdm.pdfIn PDF document text
    • http://xosuxifareg.22web.org/kulogekodogaxakafif.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/hdtjchi/heartstart_hs1_replacement_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/QTfBGhh/olympic_game_1983_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5fd1c6e228fc6.pdfIn PDF document text
    • http://kupivse.xyz/examples_of_critical_thinking_questions_for_nursing_studentse3hlj.pdfIn PDF document text
    • https://zarujiwimil.weebly.com/uploads/1/3/4/9/134900424/41f96fef9b.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/agglLhh/algebra_calculator_simplify.pdfIn PDF document text
    • https://jajugodi.weebly.com/uploads/1/3/4/9/134902248/c3cf901911239d9.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/dzgeiav/79503243751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471099/normal_603f8b4be7c98.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/7326411.pdfIn PDF document text
    • http://twitter-center.com/define_total_quality_management_in_healthcareyr3wj.pdfIn PDF document text
    • https://jukosixosibi.weebly.com/uploads/1/3/1/8/131871462/8669071.pdfIn PDF document text
    • http://xploitcrew.io/cedex_bio_ht_manuals0k7y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419626/normal_60086dc95dfdd.pdfIn PDF document text
    • https://cdn.sqhk.co/padezeda/bWSjhEp/zitatuwised.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_6049ec98157d4.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
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_f472d108afe0485681d63939243f1758.pdf?index=trueIn PDF document text
    • http://datasagedabisu.epizy.com/88593551515.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_97336515ff3c4a4dbb9f1d73fc1a3eec.pdf?index=trueIn PDF document text
    • https://a21785f5-e352-4c0e-a7c3-a232dca3c625.filesusr.com/ugd/3283b0_09f98f9676c24a39a44f1a4a6656c4e7.pdf?index=trueIn 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_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 5328 bytes
SHA-256: 93249493e0fa7940e961549d75045fe5fc7857ef9ae57a4f092346837e20804d
font_01_sfnt_off0001119b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 11092 bytes
SHA-256: 94dc617a698cc58fa283d638a4628915c46620fa6117063a42115f65ea201a32
font_02_sfnt_off0001375b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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