Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5464b4c140ab954…

MALICIOUS

PDF

82.3 KB Created: 2021-05-19 07:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f879986d2e9dc7e6304fb9dd30c1f2b0 SHA-1: a3382ddae4e9b0fe9d64f4c9af451db4ec79396f SHA-256: d5464b4c140ab954ac1b602051286226c30e63af50f2f37647914160f27fd18b
164 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on file-sharing services. This behavior is indicative of a link farm designed to obscure the true malicious intent. The ClamAV detection and ML classifier strongly suggest malicious content, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://xezojetit.ru/strik?utm_term=how+to+prepare+field+visit+report
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/b6e515d.pdf
    • https://zulozagadome.weebly.com/uploads/1/3/4/3/134318764/jokowafilise.pdf
    • https://cdn-cms.f-static.net/uploads/4374188/normal_605551b344bc5.pdf
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fe8ea7344143.pdf
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/218bed4.pdf
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/eb6197f8296aff.pdf
    • https://cdn-cms.f-static.net/uploads/4466664/normal_5fdbeade0292b.pdf
    • https://cdn-cms.f-static.net/uploads/4389085/normal_600d17f446dce.pdf
    • https://cdn-cms.f-static.net/uploads/4481052/normal_6059eb1c0b36d.pdf
    • https://static.s123-cdn-static.com/uploads/4528959/normal_5fef0e73bb50c.pdf
    • https://cdn-cms.f-static.net/uploads/4410433/normal_603f21fc9d7ec.pdf
    • https://xogefuvoza.weebly.com/uploads/1/3/2/3/132303221/bb68d514b98.pdf
    • https://razisosip.weebly.com/uploads/1/3/0/7/130739291/4369466.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ef5cf622-1dc1-4faa-a900-331f6196f3b8/32415852105.pdf
    • https://uploads.strikinglycdn.com/files/9e27ca35-086d-43c6-8676-b0c7bda5aec0/concepto_de_titulo_de_credito_en_derecho_mercantil.pdf
    • https://uploads.strikinglycdn.com/files/97b0fed2-8b2b-437e-a23f-2615e3b56f18/learn_electronics.pdf
    • https://uploads.strikinglycdn.com/files/aef5d9ad-ded6-4c84-b070-03bdb801c45a/how_much_do_they_pay_navy_seals_train.pdf
    • https://uploads.strikinglycdn.com/files/fd4bc531-2933-49ea-ba97-53f15b7bb233/19876492331.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_off000103eb.bin
ba718fc1f596fe13569edaa0cf77491051f00198eace382f2f328d794b502b98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 5148 bytes
font_01_sfnt_off0001158f.bin
527495ed0b4fe60fbbfff7afe981936b583b9a088371ba3c48f9460fe0104ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 11280 bytes

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