Malicious PDF — malware analysis report

Static analysis result for SHA-256 193d634bfdff431d…

MALICIOUS

PDF

82.9 KB Created: 2021-06-01 14:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f73a1b7cce845d0fed7759e0c069c5d SHA-1: 9b596c9c4637ce045fe0f7a3a44ee4eb3f0d5e7c SHA-256: 193d634bfdff431dac3280e03736337b92bccc4347f897cd2046a122c7ef41b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a malicious intent to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. Although no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/pbw?utm_term=how+to+fill+out+a+business+tangible+personal+property+return
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/xiseviwubogijosun.pdf
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5fec48b3c6dfd.pdf
    • https://cdn-cms.f-static.net/uploads/4491433/normal_5fdc37c03f64f.pdf
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/daeebe0a.pdf
    • https://bunonosuvon.weebly.com/uploads/1/3/5/9/135976801/lovuxo-nebozoguva.pdf
    • https://cdn-cms.f-static.net/uploads/4461746/normal_6052f883b4707.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lekuzax.pbworks.com/f/gelebonegulufowatuwaf.pdf
    • https://uploads.strikinglycdn.com/files/a60e221a-5ed2-4501-9537-6c59e64fd323/2877290697.pdf
    • https://uploads.strikinglycdn.com/files/a471766c-6daa-4335-a6d5-698d3f7735ef/tokyo_ghoul_opening_roblox_id.pdf
    • http://vadibun.pbworks.com/w/file/fetch/144436953/51325526407.pdf
    • http://poforezufovu.pbworks.com/w/file/fetch/144455649/cambridge_ielts_vocabulary_english_to_bengali.pdf
    • http://dipoziw.pbworks.com/w/file/fetch/144448689/seven_p_of_service_marketing_ppt.pdf
    • https://uploads.strikinglycdn.com/files/a603fb04-1ff9-4cce-ba15-53216342014f/is_it_safe_for_a_diabetic_to_do_the_keto_diet.pdf
    • http://papoxuva.pbworks.com/w/file/fetch/144423429/nigitazijabasom.pdf
    • https://uploads.strikinglycdn.com/files/cbb24bfd-0b75-4735-9d0d-4e96265b3bc5/sahih_bukhari_8_82_830.pdf
    • http://garigor.pbworks.com/w/file/fetch/144424254/ejercicios_de_futuro_simple_y_continuo_en_ingls.pdf
    • https://uploads.strikinglycdn.com/files/50adcbf8-8c72-485e-a797-e452bd1cfabe/plantronics_explorer_500_mobile_bluetooth_headset.pdf
    • https://uploads.strikinglycdn.com/files/580f5fcf-665f-4f54-abb4-55f0f1dc5916/40071870783.pdf
    • https://uploads.strikinglycdn.com/files/72fd3167-55f9-427f-b0e7-c767cb4bded6/sexadupeniw.pdf
    • http://midevodimu.pbworks.com/w/file/fetch/144454938/xijad.pdf
    • http://nadupodifado.pbworks.com/w/file/fetch/144431853/39963490718.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103fa.bin
ea5abc522aa7c3d1a470c47166cb04ac9484bf0edb8e2fd1d1dddcec151bd88d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 5364 bytes
font_01_sfnt_off0001165f.bin
08e7f1dd64bd7ce643a035a2d920cab6e9df26ce8ec99910a5c2fd85e28f17f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 11720 bytes

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