Malicious PDF — malware analysis report

Static analysis result for SHA-256 97cb98d42d6bf927…

MALICIOUS

PDF

80.5 KB Created: 2021-05-21 10:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e77d745e0553ebc97da93aafa0e371fc SHA-1: 24470cecde6ae30e3e9f9cf76494806f21fe8dde SHA-256: 97cb98d42d6bf92724f421b37b4c449c6f2c525fd800c1100f40e254f29b055a
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to drive traffic to external sites. The embedded URL 'https://xezojetit.ru/strik?utm_term=can+i+draw+up+my+own+separation+agreement' is a primary indicator of this malicious activity. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0', further confirming its malicious nature. The document body, though partially corrupted, suggests a lure related to legal agreements.

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://xezojetit.ru/strik?utm_term=can+i+draw+up+my+own+separation+agreement
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/fuwakafevevoxuloti.pdf
    • https://cdn-cms.f-static.net/uploads/4403531/normal_6044912b4be13.pdf
    • https://dagojamigim.weebly.com/uploads/1/3/4/7/134763314/238717feeb.pdf
    • https://cdn-cms.f-static.net/uploads/4421474/normal_602239b5a4a26.pdf
    • https://cdn-cms.f-static.net/uploads/4454180/normal_5fe7c1c93c33e.pdf
    • https://cdn-cms.f-static.net/uploads/4476590/normal_5fe6293608097.pdf
    • https://bazojosazim.weebly.com/uploads/1/3/6/0/136086377/dubedeko.pdf
    • https://cdn-cms.f-static.net/uploads/4384633/normal_603a3e868b3e9.pdf
    • https://cdn-cms.f-static.net/uploads/4443610/normal_5fda6a014cf41.pdf
    • https://cdn-cms.f-static.net/uploads/4503692/normal_606027a92dc91.pdf
    • https://static.s123-cdn-static.com/uploads/4410714/normal_5fee78c17c195.pdf
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/7352392.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e078d420-f403-44c0-b216-58b608882112/41526241863.pdf
    • https://s3.amazonaws.com/jeromisixinolib/fenebadonasogusitomipuwek.pdf
    • https://uploads.strikinglycdn.com/files/ce284c8a-7a46-4c84-91f6-510f24d8cfc8/honda_rebel_300_rider_weight_limit.pdf
    • https://uploads.strikinglycdn.com/files/ef18600d-99a7-4467-94f6-499184e9dd4c/how_to_program_chamberlain_garage_door_opener_without_remote.pdf
    • https://uploads.strikinglycdn.com/files/bf4f3912-c5b0-49bd-b9df-1b7440d5172b/how_much_does_an_interior_designer_cost.pdf
    • https://uploads.strikinglycdn.com/files/ad98cea4-e535-49d2-9657-f3c4316a4339/puzoluz.pdf
    • https://uploads.strikinglycdn.com/files/5b4d3dc6-5859-4e1d-92d2-d6a9c22bbad0/gabavulokaka.pdf
    • https://s3.amazonaws.com/fizufapu/baby_boy_names_free_download_in_tamil.pdf
    • https://uploads.strikinglycdn.com/files/34da8232-5af1-494e-bc4d-ff5d71138ea3/kenmore_elite_stove_manual.pdf
    • https://uploads.strikinglycdn.com/files/148deee9-1592-4fae-8ea2-fdd285fce5f1/tp_link_smart_plug_apple_homekit.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_off0000fd72.bin
c889f731fa3f2a9d1e365750b0ff1edc4254266070bc9edf3e3d1486f3d5690f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 5348 bytes
font_01_sfnt_off00010fa4.bin
4d732241a41a12875f08fbb1e279685aeedd1213054092dd5e53807c26e85731
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 10844 bytes