Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f79ac1e04e08dcb…

MALICIOUS

PDF

105.5 KB Created: 2021-03-22 06:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8f59e6507b06211cef3a837b6eaa9ae SHA-1: d81da134cb6b145c45d37c6c4b569b31658c2f29 SHA-256: 4f79ac1e04e08dcb66e08cbeceb4c5a58b78b4ccc5060ed92e164077cc5f2a2d
136 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with a high-confidence heuristic indicating a payment redirection lure. The embedded URL, https://dafemum.ru/strik?utm_term=the+three+sisters+house+on+mango+street+questions, likely serves as the initial point of contact for this phishing attempt. Although no scripts were explicitly extracted, the PDF format and the nature of the lure suggest potential for embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://dafemum.ru/strik?utm_term=the+three+sisters+house+on+mango+street+questions
    • http://glasshookahcatering.com/ropifirisumisfer41.pdf
    • http://osummer.space/nugefetubezanikadepeteniotz5q.pdf
    • http://burutevopu.iblogger.org/nisamunoparu.pdf
    • https://static.s123-cdn-static.com/uploads/4372681/normal_5fc9285d9b7a3.pdf
    • http://gedawuxofawu.iblogger.org/8105001680.pdf
    • http://ketokod.iblogger.org/portable_beyond_compare_free.pdf
    • https://cdn-cms.f-static.net/uploads/4373797/normal_60528573381c2.pdf
    • http://amsidisi.xyz/30895840974sc6cd.pdf
    • https://static.s123-cdn-static.com/uploads/4446264/normal_5fe17fc095434.pdf
    • http://habercigo.com/58732092161cr99m.pdf
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5fdc2be16a537.pdf
    • http://ronefed.iblogger.org/venizuzovi.pdf
    • https://static.s123-cdn-static.com/uploads/4426812/normal_5fecf4fda7d37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_85a52a9a223b4ee1bc4ad25f19e248dd.pdf?index=true
    • https://27aa3d6a-fcc1-4574-a8e0-77dd5bf64dcc.filesusr.com/ugd/7683ec_55010327b5604176b39113c43e0806e9.pdf?index=true
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_b9c990e99994490a97eb0bc6f466c278.pdf?index=true
    • https://0e733887-fd72-4d21-8b10-0a39cafbc931.filesusr.com/ugd/1e4d10_16f9864dd4d24de59c9c3e9087b219b7.pdf?index=true
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_f5521d5a9d734a309dd50f1b9cd3b165.pdf?index=true
    • http://jawafezirosozo.epizy.com/affairs_cloud_december_weekly.pdf
    • http://kaguwetu.epizy.com/snow_white_with_the_red_hair_episode_6_season_2_english_dub.pdf
    • http://mawarine.epizy.com/19223676873.pdf
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_7d2fc49e1d354f15a0d8f2a5a3160128.pdf?index=true
    • http://nugejazozebosud.epizy.com/71554920390.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_off00015e2d.bin
87d60e38c5ca370cafbe9f9d11f8c67455d60cd42e8fedabb3b7b66b61522fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2D 5140 bytes
font_01_sfnt_off00016f77.bin
b50c6b3dad5df0552a4420480ef245c530ca6f61c50ec88132a84c42aaeb9e62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F77 12236 bytes

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