Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1ffcf41f76ea51…

MALICIOUS

PDF

76.6 KB Created: 2021-05-21 03:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 066c876e529b4e2f56637def4b244e5e SHA-1: d4bf2a1a774d0230ddfdc8c4f611f2a877ecd66a SHA-256: fb1ffcf41f76ea51989b6655b94bca68424709a699bd19756f2b339c6fa1ad55
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://ponafet.ru/strik. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=how+to+install+android+on+kindle+fire
    • https://cdn-cms.f-static.net/uploads/4402936/normal_604cdf6eee702.pdf
    • https://gawowulovo.weebly.com/uploads/1/3/5/9/135966180/5476161.pdf
    • https://zejatuno.weebly.com/uploads/1/3/0/7/130776413/2291044.pdf
    • https://static.s123-cdn-static.com/uploads/4467005/normal_5ff109b3cbca7.pdf
    • https://jokuduzasaru.weebly.com/uploads/1/3/1/3/131381103/xobexenufadetom.pdf
    • https://mezonojasu.weebly.com/uploads/1/3/4/6/134639114/2cabab832d7c3.pdf
    • https://lobalose.weebly.com/uploads/1/3/6/0/136089755/158210.pdf
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/9dfd7.pdf
    • https://vajubepodeno.weebly.com/uploads/1/3/0/7/130776779/f98450.pdf
    • https://wemafijape.weebly.com/uploads/1/3/4/7/134775870/getupanokoxazas_vusukijabit_fobutafi_fabexe.pdf
    • https://kaxukododeregoz.weebly.com/uploads/1/3/0/9/130969338/3d9a5ac8afb.pdf
    • https://cdn-cms.f-static.net/uploads/4406514/normal_602c2f3f442bb.pdf
    • https://luvokivimowef.weebly.com/uploads/1/3/1/6/131607407/1207304.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/492c0a3f-0e9e-4fa0-b16c-0d62fdf1e163/hp_stream_11_pro_g5_release_date.pdf
    • https://uploads.strikinglycdn.com/files/54f0a7a3-81b1-471a-8e79-269932dee8b1/470487007.pdf
    • https://uploads.strikinglycdn.com/files/08393300-7d79-44ea-81f5-7759d2b97206/98319712205.pdf
    • https://uploads.strikinglycdn.com/files/b535bdf4-357f-4475-a81f-1f3724bf960b/how_to_use_a_seamstress_sewing_machine_step_by_step.pdf
    • https://uploads.strikinglycdn.com/files/133a9c52-817d-49b6-950d-e8cd6cab0581/change_the_culture_change_the_game_free.pdf
    • https://uploads.strikinglycdn.com/files/ac9d1317-fa2e-40e7-9f48-b4825fa1eb8d/after_hours_stock_market_news_today.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_off0000ee6b.bin
8c204798cd44b0435edf3fcd36e7829061dc5054b7d0e2a529eda995705d214a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 5020 bytes
font_01_sfnt_off0000ff9b.bin
7f23e1f5ee5d28e9852530dd55e82054d0d27fa471a8c9a1f170aaba9f375be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 11008 bytes

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