Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca32a27e5132c8a5…

MALICIOUS

PDF

86.9 KB Created: 2021-03-21 22:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b51658681b69a9c074e147e80376e2da SHA-1: 6ee901806e03c20ebb4d525b0ada0ef21ede11b6 SHA-256: ca32a27e5132c8a5c0153a906262f335dc4699ffe0e44395429eff7a68b13d99
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to various websites. One of the primary URLs, 'https://ponafet.ru/123?utm_term=filling+out+deductions+and+adjustments+worksheet', is associated with unknown reputation, indicating a potential phishing or malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=filling+out+deductions+and+adjustments+worksheet
    • https://static.s123-cdn-static.com/uploads/4421199/normal_5ff435be12e0c.pdf
    • https://cdn-cms.f-static.net/uploads/4404514/normal_6016c5d078efb.pdf
    • https://turoliletipusu.weebly.com/uploads/1/3/5/9/135969349/zekuxovoniti-kisemusafezuge-xakomumo-pifugizo.pdf
    • https://static.s123-cdn-static.com/uploads/4456128/normal_5ff68c1409ed8.pdf
    • https://sejubapis.weebly.com/uploads/1/3/4/8/134887951/lumukezozizi_pefupa.pdf
    • https://fuxilidunud.weebly.com/uploads/1/3/5/3/135314653/7c87285a6a44d.pdf
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/2291221.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ac6a5e95-3fab-4d4b-a7e7-0ef4c71e5929.filesusr.com/ugd/32c278_9097f3ba451a4d4eaee9de44483500b9.pdf?index=true
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_3c4f3fcf5b164f738ab417e460954911.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0ca615a3-a49f-49c7-b6dd-c0d27a6bdc71/its_kind_of_a_funny_story_sparknotes.pdf
    • https://uploads.strikinglycdn.com/files/89d90081-ebce-450f-924b-6bfb13aa0056/panisobil.pdf
    • https://uploads.strikinglycdn.com/files/f7deb97f-c480-4264-bd09-cd587d0448e7/how_to_start_magic_chef_dishwasher.pdf
    • https://uploads.strikinglycdn.com/files/c57a2670-4ad3-4492-9ad4-ecb8ab73d73d/xinavase.pdf
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_6dd939e0f3fe491a807d08ec6dfa2d95.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8aad187a-14bb-4e06-83f5-b38f6a8fda0a/loxipotasoxuwisulige.pdf
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_ec59a2e3c7be45e3984b3cfb81ab15f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/768a12b0-332e-4038-bf00-ca1a8e7d39b1/the_game_mens_dating_book.pdf
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_4d3036ed30b24955b2c195dfded69563.pdf?index=true
    • 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_off0001152f.bin
b9023a1a4ba5b1cf647862fff6f3e0f2e6760abfb2d006051ee784c59cc41227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 5540 bytes
font_01_sfnt_off000127f5.bin
16fa3d627f6df17f74e74dec6de6125e284886207860707b0c7e1f0af9d57a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F5 11164 bytes

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