Malicious PDF — malware analysis report

Static analysis result for SHA-256 139d069799a9ffe9…

MALICIOUS

PDF

79.3 KB Created: 2021-02-13 09:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 429d0be06bdd85c41c48a71afb1c0464 SHA-1: 9b893211ac130a6a0da513f21991bda217b2ab68 SHA-256: 139d069799a9ffe92273c4fe8d2fd3b849c034f8d1be03d78ab8254e3c06b247
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious content, potentially a phishing page or a second-stage malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=richard+clayderman+a+comme+amour+sheet+music+free+pdf PDF link annotation
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/8694d548c4.pdfIn PDF document text
    • http://balifruit.com/tn_11th_chemistry_book4su2m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_5fda24eeb5167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446921/normal_60214e34af246.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/rudisotub.pdfIn PDF document text
    • http://dektesheff.xyz/building_tiny_homes_for_homeless_veterans9gsy8.pdfIn PDF document text
    • https://vusuranozaxo.weebly.com/uploads/1/3/4/0/134012668/rajibowivanama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_60132af3f0e29.pdfIn PDF document text
    • http://hhizmet.com/asian_literature_historykr8s5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/piwugoz.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/economic_sectors_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/ebay_kleinanzeigen_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/formation_biologie_medicale_france.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/allu_arjun_film_free.pdfIn PDF document text
    • https://musescore.com/static/musescore/scoredata,jsoIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 5388 bytes
SHA-256: 99b4e814a0c85e2cb7e365c94d256999a08ec9bf64c31c9238c120b299966271
font_01_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 11324 bytes
SHA-256: b56f6129703df2d0a37e66f43867a8a7d25825fba7d065b7f1107b8b1b92dcfd
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_03_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 9808 bytes
SHA-256: fec8f8460ba53a4ff4c57443a0a0348b29b5483e1abc2d7d076dd5abc7fed832

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