Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51d7a61d0fba4ef…

MALICIOUS

PDF

84.1 KB Created: 2021-04-14 08:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c2192469240285c943756f2959cfb84d SHA-1: 249395bf47521fe1e1224132fc83e9bb2d4469fa SHA-256: e51d7a61d0fba4ef2f6380beeddab6a357713e15447bf664125f01df0d6e89a4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a significant portion hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=can+you+learn+to+drive+in+the+navy PDF link annotation
    • https://cdn.sqhk.co/kogoruzojif/hFgiATV/loxitobuso.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/dutazozukapodonotalep.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/bhazeif/37388333002.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_6052fb7cdfa9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_6056e989986cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_6066b1689a877.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/algebra_lineal_grossman_septima_edicion.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/hmidjbg/real_followers_apk_mod_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/ifyjfjf/lugadesuwigo.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/47473634854.pdfIn PDF document text
    • http://geguxejap.22web.org/cannot_find_java._exe_ireport_error.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/alicyclic_chemistry.pdfIn PDF document text
    • http://palipupo.22web.org/does_cool_mist_humidifier_help_sinuses.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/heihEji/3d_ball_balance_extreme_adventure_course.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5ff7ff7f75ae7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sepawi/aulad_bhojpuri_movie_hd.pdfIn PDF document text
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_072fbce7cb194012a07f0e0f88379258.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/98564562091.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_2c52c867e5c04bad86934ae7b4ce3467.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/sony_camera_a77iii.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 4804 bytes
SHA-256: 4f91e809b7e87a29d313b3742245cef10cff114f68c448934589e7b20de80149
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 11308 bytes
SHA-256: 31824761326905e2ea750f40fbbf2b0b0a4cdf2592dcf0e00116f1a412df0ce0

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