Malicious PDF — malware analysis report

Static analysis result for SHA-256 21105f56e9014674…

MALICIOUS

PDF

72.0 KB Created: 2020-12-18 04:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12ee6fa116d2aaa18d418b017f668c9a SHA-1: 7d769cce2fa0176b31cd42ff727525bfffd25e3f SHA-256: 21105f56e9014674331e30dc0dffb40be06bccae000c7a705d1cb578ffbfae64
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a suspicious URL pointing to 'traffine.ru', suggesting a link farm or phishing attempt. The presence of a 'Download Button' heuristic and a callback lure further supports a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

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
  • 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.
  • 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://traffine.ru/strik?utm_term=tazewell+county+courthouse+address
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/sorom-jupovijikixi-velafaxibuvi.pdf
    • https://vomalokigalexa.weebly.com/uploads/1/3/4/3/134329787/3dee91f1.pdf
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/53fbfb12f9b9d.pdf
    • https://vapuwunenerupig.weebly.com/uploads/1/3/4/7/134727873/767526.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcee619d104e5f152c655a/1606217313762/nomape.pdf
    • https://static1.squarespace.com/static/5fc6d3bb48c1673e5598f85d/t/5fd719efab1a676c72a6693a/1607932400091/risigagikow.pdf
    • https://static1.squarespace.com/static/5fc102e7bda9c57a97beca32/t/5fcf1ce70496d067bdcbf79a/1607408871533/hexaware_bps_revenue.pdf
    • https://static1.squarespace.com/static/5fc102e7bda9c57a97beca32/t/5fc405ba61e25426e1b5200a/1606682044862/supervpn_free_vpn_client_apk.pdf
    • https://static1.squarespace.com/static/5fc5ac2eabaecd331842ccaa/t/5fd1faecb1f69267715b8d42/1607596780537/male_to_female_voice_changer_pc.pdf
    • https://static1.squarespace.com/static/5fc575ad2bbd740658254770/t/5fcb5d4a33fb14715cba5c01/1607163210479/super_adventure_island_2_snes_rom.pdf
    • https://uploads.strikinglycdn.com/files/72e1d2d8-f12f-43c5-97e6-0c1753e32b7b/fisica_universitaria_volumen_1_13_ed.pdf
    • https://static1.squarespace.com/static/5fce08ab0db0542b884d6e77/t/5fd17ff9f2ee360040f080af/1607565305452/shelter_vs_zombies_2_pc_download_direct_link.pdf
    • https://static1.squarespace.com/static/5fc542ce9698b02c7f3d61af/t/5fd5f13e481cfa31adbc3266/1607856451442/monthly_budget_planner_android_app.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_off0000db0e.bin
8ef34a98f1562bf80ca481a73aa2272961c75e29f4e8030897a630c6f0259284		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0E 5220 bytes
font_01_sfnt_off0000ece6.bin
e1d8d21fc86fd6c81f7c89f0950f932183e0971f4044277b6b35051a7c0b4190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 11040 bytes

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