Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21b6252f89cbb42…

MALICIOUS

PDF

100.5 KB Created: 2021-05-22 00:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10dda2fec8727b910586a8251ed93553 SHA-1: d791ed18b3ae2f795a5d9a7537b7201ace08a52d SHA-256: a21b6252f89cbb42d090344f4e264ec4ff5d36444805d127c0d8e0b32c3195cc
176 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm and a callback phishing lure, suggesting a social engineering attempt. The embedded URL `https://leonvi.ru/strik?utm_term=how+to+activate+dish+tv+account` is likely part of this lure, aiming to direct users to a malicious site. ClamAV also detected this file as `Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0`, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=how+to+activate+dish+tv+account
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/75fd359d.pdf
    • https://static.s123-cdn-static.com/uploads/4410988/normal_5fe3a3307b875.pdf
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/9616e26.pdf
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5fd0a760c4653.pdf
    • https://cdn-cms.f-static.net/uploads/4476285/normal_5fd96c6502358.pdf
    • https://cdn-cms.f-static.net/uploads/4448743/normal_602231a058e4f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zemunomipazikez/30643693814.pdf
    • https://s3.amazonaws.com/dazovosugev/what_colour_is_your_parachute_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/08f8852a-1307-4b53-a355-a19c050da87d/bevolokonixiraw.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/dagebo.pdf
    • https://s3.amazonaws.com/rirusozo/67100644200.pdf
    • https://s3.amazonaws.com/fedure/38597809636.pdf
    • https://uploads.strikinglycdn.com/files/8186daed-d207-480e-abcf-f81475e39d86/family_violence_safety_plan_template.pdf
    • https://s3.amazonaws.com/kozewuposoridil/join_excel_sheets_online.pdf
    • https://s3.amazonaws.com/vojapu/zomexupulipukosejo.pdf
    • https://s3.amazonaws.com/vukumesoj/paletufonafajemil.pdf
    • https://s3.amazonaws.com/somisilegex/12868249930.pdf
    • https://s3.amazonaws.com/gozilum/79419740236.pdf
    • https://uploads.strikinglycdn.com/files/402d8063-7945-467e-b383-42a8087f7870/besuxagejulolarotawi.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/payment_receipt_document_template.pdf
    • https://uploads.strikinglycdn.com/files/c57134c5-1bfc-4341-8ef7-39693680bd49/pit_bike_dirt_bike_shops.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_off00014a9c.bin
1f674f8734ff982ac4dcbe7bccbcc99080495b0d25af593e9c83de27135917f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9C 5012 bytes
font_01_sfnt_off00015bbc.bin
12ae88eda6b9bc6412130c5e9a4f5f71677244ea338282b6d280a94d24811108		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBC 11612 bytes

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