Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e396bd2d7a44b1…

MALICIOUS

PDF

78.4 KB Created: 2021-05-12 12:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4a68373fd8551b5aecafa260ff8e5ae SHA-1: 6bc8294839da5ffd64793702179f01e05b0e6a99 SHA-256: b1e396bd2d7a44b1c0ba6925b0901af0d3975456fac15267877342d1b6fed9c8
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a malicious domain, identified by both heuristics and ClamAV as a phishing/trojan. The document body, though heavily obfuscated, appears to be a lure related to a 'biology chapter 2 crossword puzzle'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://midufefew.ru/strik?utm_term=biology+chapter+2+the+chemistry+of+life+crossword+puzzle+answers
    • http://tinubawolu.mywebcommunity.org/viworopimofis.pdf
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ffe84aa361d3.pdf
    • https://cdn-cms.f-static.net/uploads/4452381/normal_5fd75ffb11c5e.pdf
    • https://static.s123-cdn-static.com/uploads/4382772/normal_5ff3d906371cd.pdf
    • https://static.s123-cdn-static.com/uploads/4370541/normal_5fc6ac2c414e6.pdf
    • http://rowefuzoj.mygamesonline.org/20728563283.pdf
    • https://cdn-cms.f-static.net/uploads/4493209/normal_602063997b283.pdf
    • https://cdn-cms.f-static.net/uploads/4410199/normal_602a439120168.pdf
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd14affe7bda.pdf
    • http://vorusobowa.66ghz.com/ciencia_y_tecnologia_en_mexico.pdf
    • http://rakapugijumub.sportsontheweb.net/60558013225.pdf
    • https://cdn-cms.f-static.net/uploads/4454977/normal_605674d51bb68.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://momesesewoja.rf.gd/44513835765.pdf
    • https://uploads.strikinglycdn.com/files/96322b5c-55e4-4290-a277-7caca9f678e9/why_is_my_oven_fan_not_turning_off.pdf
    • https://uploads.strikinglycdn.com/files/1af43486-6c01-4532-a120-c734e0cddfd5/differences_between_evolutionary_and_revolutionary_new_products.pdf
    • https://uploads.strikinglycdn.com/files/43cc3a9d-b7f9-43be-abc1-6bf2e588cc27/6084163456.pdf
    • http://tuzepezajofar.epizy.com/avoir_etre_faire_aller_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/e029bfad-81f8-4165-b8db-8c3d8395f64a/jamureri.pdf
    • http://gagisejokunego.rf.gd/trait_de_versailles_1919_texte_intgral.pdf
    • http://namakanexir.atwebpages.com/gaxokolobojabaza.pdf
    • https://uploads.strikinglycdn.com/files/f313e76c-b0ca-473d-8ff7-83d702e5cb58/sodumimipufajudoruf.pdf
    • http://dominomufu.rf.gd/31690314079.pdf
    • https://uploads.strikinglycdn.com/files/0b89cd1e-1891-489e-9edd-31807a5e24fc/4g_lte_cellspot_setup_video.pdf
    • https://uploads.strikinglycdn.com/files/329fddc8-2dc1-439f-8d10-4be7a1639294/sewed.pdf
    • http://palexibibiw.atwebpages.com/92642985268.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_off0000f18f.bin
c850d496f107262e3979629b64ad3fc4f4d5b778978745c3609f4102a4334f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5992 bytes
font_01_sfnt_off000105f2.bin
3b07daac54fe1ffeb0518e104ef51f3a99b2d8189b990bcc3138d97f312c64bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 11360 bytes

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