Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e239c4ed663203f…

MALICIOUS

PDF

90.1 KB Created: 2021-03-01 11:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2bda0c6661fc6f3bd63f3b9bc7ca3c3b SHA-1: 1b917f50b0b17f3f57473c62852fc59d801f7889 SHA-256: 6e239c4ed663203f022bfe1f2f4b6d95ed775a46c6dca5a2272a69ca0b7230a0
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with a notable one pointing to 'druttle.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=who+invented+basketball+in+the+usa PDF link annotation
    • http://criticcxck.space/built_2_last_construction6owsc.pdfIn PDF document text
    • http://italia-doc.fun/paxonovuwimomamufxlfx.pdfIn PDF document text
    • http://maserolamo.22web.org/33831161690.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/mugiwotigepizojomadojarep.pdfIn PDF document text
    • http://zoo-taxi.site/crown_cdi_1000_no_powerzsps0.pdfIn PDF document text
    • http://berozava.iblogger.org/brine_shrimp_lethality_assay.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/97662580884.pdfIn PDF document text
    • http://lujakivuvig.22web.org/21990381470.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/jesirujuk.pdfIn PDF document text
    • http://reduslimitalia.site/acls_test_questions2ip5m.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://dazomaxewu.epizy.com/bed_cet_admit_card_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/26_schwinn_sidewinder_womens_mountain_bike_matte_black_pink.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/11682966688.pdfIn PDF document text
    • http://xojozefobulujox.epizy.com/96495637919.pdfIn PDF document text
    • http://pimuxexud.epizy.com/98099880848.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/64726735154.pdfIn PDF document text
    • http://vuvazapej.rf.gd/behringer_xenyx_2442fx_power_supply.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/aprendizajes_clave_secundaria_historia.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_off0001175c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175C 4976 bytes
SHA-256: 060a0bde0bdd59156bd6db7da02aa1bbbea49c5398d4a78fcb468282b10358c8
font_01_sfnt_off00012848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12848 10688 bytes
SHA-256: 7dbda862e28494445863cb13b3c49f9adb63d843767ccbd7511499af855b3296
font_02_sfnt_off00014ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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