Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfafc83f5f2226f0…

MALICIOUS

PDF

80.9 KB Created: 2021-04-13 10:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d491374f3406c88dfb877874c23183 SHA-1: bf01f9e0a408c6c63f165bcb108560e8ea37cf11 SHA-256: cfafc83f5f2226f0c6908ecd9b40062973d14a27bc5f16791da414295d965caa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a potential link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the nature of the links and the heuristic firings point towards a phishing or malicious redirection attack.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=what+do+wooly+bear+colors+mean
    • http://cleaner360.shop/sony_str_1030_manualo24fs.pdf
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/basokor.pdf
    • http://padlamadla.site/tomalr3j3c.pdf
    • http://usacarins.com/how_to_set_up_my_netvip_wireless_repeatert2azh.pdf
    • http://stepka2016.xyz/problemas_de_optimizacion_resueltos_selectividadvm1q1.pdf
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/bc945577961c.pdf
    • http://sesaruzuvibi.22web.org/how_to_start_a_low_carb_keto_diet.pdf
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/kijisenigosawonez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_a843d187080d4e7aa3d672e5adb899a0.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_5f6ac024a0b94c0ab0e8db89731b7651.pdf?index=true
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_92c700b76ec343699bc3205ace99e8f8.pdf?index=true
    • http://vilulew.rf.gd/91054898631.pdf
    • https://uploads.strikinglycdn.com/files/47449b0a-142c-4979-918f-84e8de40ed3b/guduzugefedotabunabefid.pdf
    • https://uploads.strikinglycdn.com/files/8a76d0f3-a468-4446-9afb-0b2ece5ea786/bigaxuveze.pdf
    • https://uploads.strikinglycdn.com/files/600757f8-6945-4aae-adf8-152ef8fad43b/gorilla_my_love_lesson_plan.pdf
    • https://uploads.strikinglycdn.com/files/617024bb-5d66-4e3c-8eaa-188774a345f0/crystal_bible_volume_1.pdf
    • https://uploads.strikinglycdn.com/files/c129a546-7218-44a2-b07c-e1d94dd937a1/what_does_hola_mundo_mean_in_english.pdf
    • https://uploads.strikinglycdn.com/files/f666fac8-68e8-4d7f-aada-0664716d867f/howl_poem_quotes.pdf
    • https://uploads.strikinglycdn.com/files/124147ed-bd4c-4fd7-bd55-97cc3a4706c9/lizivefufowiwu.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_off0000f3e7.bin
9a3fe52bc0ee5ff5c0b5cba18e5eb3da9fefdc953981ecc25fbc9e09ba6b6438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 5268 bytes
font_01_sfnt_off000105bc.bin
672ebfee2e379b7c7fc81f0fe8bf14ff74ce536d37f48f986f905ac6296ba09b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 10264 bytes
font_02_sfnt_off000128a4.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128A4 4324 bytes

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