Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93f3a4afb4eab2e…

MALICIOUS

PDF

78.6 KB Created: 2021-05-06 15:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61492ebfc7df1203c2fe4446ff28167c SHA-1: 1c58487b067cc360924867dccf0b33031b911030 SHA-256: b93f3a4afb4eab2e5813e9cc83ed7c63d7a8678d2535e8b171ff28bdc4ebab4d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, with the primary one being to 'resalured.ru', suggesting a link farm or content aggregation strategy. The document body, though heavily obfuscated, contains keywords related to 'sweep picking' and application metadata, which are likely lures to encourage clicks on the embedded malicious URLs.

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://resalured.ru/strik?utm_term=best+sweep+picking
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5fd8f1852bf54.pdf
    • http://tiwigibafofovit.iblogger.org/58552074588.pdf
    • https://cdn-cms.f-static.net/uploads/4468831/normal_602e1a310c622.pdf
    • https://cdn-cms.f-static.net/uploads/4378599/normal_6039b58aaae0f.pdf
    • https://cdn-cms.f-static.net/uploads/4463264/normal_604998f7bb7c0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_2d4ba777d01840f39b6113c323b19572.pdf?index=true
    • https://uploads.strikinglycdn.com/files/540751c2-59f9-4a69-b8bb-4499ddf3b4d2/lediwaribaf.pdf
    • https://uploads.strikinglycdn.com/files/5cc3ffda-748f-4974-b6ed-0c5d140c4211/redizerevevapobu.pdf
    • https://uploads.strikinglycdn.com/files/eb1c4005-0432-4a90-be17-bc47aac9be44/how_to_write_a_legal_last_will_and_testament.pdf
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_e1c65493a8364378ad9825946c25d825.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc4b4224-7c33-40b6-9e15-ce053c8f1ed2/26477159487.pdf
    • http://gudenojotu.epizy.com/30804817050.pdf
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_2d3c7a9fc9684f9e9f17c4a91054d3a8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94ef46b3-9d86-4c30-a212-9753620e25ce/57405671674.pdf
    • https://uploads.strikinglycdn.com/files/8fe0436b-43b3-4b9c-85c0-f23ddf0d8f4e/ipega_9023_ios_game_list.pdf
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_e5cd1a51b0024045b5320ba57e569010.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8d703ff8-0eb4-4715-9ab6-045e46c052c0/how_to_reset_merkury_bluetooth_headphones.pdf
    • http://xakafof.rf.gd/eu4_institutions_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e916.bin
813ebd7d5bf6628bb32763ed2c3605b4e775bdc5788ca8e627b007dfb26891a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 4644 bytes
font_01_sfnt_off0000f910.bin
034b25b1045258a27d76f6fd542d16e2e2c93446a4616a0476853e517d419e6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 11240 bytes
font_02_sfnt_off00011f69.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 4324 bytes

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