Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f37b88973acb88…

MALICIOUS

PDF

88.9 KB Created: 2021-03-22 22:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f23f969eb086ccb2f0278111649f181a SHA-1: be0197a535af35791572f4da211dd377973f00b8 SHA-256: 73f37b88973acb883f4fd9f21d9b083b57d9673112636849be1a69312d5fbb63
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms to obscure malicious destinations. The presence of a download button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The primary malicious URL identified is lozipotod.ru, which is likely used to serve the next stage of the attack.

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://lozipotod.ru/wix?keyword=legend+of+sword+and+fairy+steam
    • http://ziposodepow.mywebcommunity.org/multicast_routing_protocols.pdf
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/fivavefubewaj.pdf
    • http://gapagal.mywebcommunity.org/reglage_carburateur_voiture.pdf
    • http://borejukeluteva.mygamesonline.org/tekiji.pdf
    • http://fabujisaw.mygamesonline.org/2452849773.pdf
    • https://vudefuzafovafid.weebly.com/uploads/1/3/4/6/134630521/xudokevudunifevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_1e15e8f0b0cb48a1ac67eb5c68adb52f.pdf?index=true
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_2e7be7fbb5014b20b71ae52caa4d5e21.pdf?index=true
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_43d226b9adb64c2ea91aa5ad80863276.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23dcedec-6b44-4009-be83-49fd3bf4fe50/didavaxa.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_2871f3f72df94cae8608fe7ab1a6182a.pdf?index=true
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_0187056f9abf42829674ffed02a259c9.pdf?index=true
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_296c853cf2b145798c867788657421b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de0150ad-5261-467b-92a3-fff63970c6b5/rexavezekiruvimumed.pdf
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_496dfcab4ce14d319a88f40cfaf02056.pdf?index=true
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_7df65390523542398cfcb7f89a036860.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed6eb478-9334-4871-956b-fe91384c2da6/82963076513.pdf
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_db209d730f04498cb75fd87ddf106aed.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_off00011ea7.bin
5a699c63a2eabea2005ae3af0b197791bc13a5703465e806cfd9ca89f74f476c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 5328 bytes
font_01_sfnt_off000130d4.bin
445446f1d1fa3db8464d2cb30381aba4264d3aafe8b1ed4b347d8339e2369be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 11052 bytes

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