Malicious PDF — malware analysis report

Static analysis result for SHA-256 548fbeb0724fa1f4…

MALICIOUS

PDF

78.5 KB Created: 2021-03-21 22:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e9b3023f249a3f162187e648bd78ec46 SHA-1: 332003da22665fd3469495a9101741d0297674a1 SHA-256: 548fbeb0724fa1f4863cd41e23d9556c4ec46fb97f70d9b5c44201d1dbd83265
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create such link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/123?utm_term=significado+de+la+palabras+languidece PDF link annotation
    • http://lessonsonline.site/88762144393u6cb3.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/hpTQVOL/45516777657.pdfIn PDF document text
    • https://cdn.sqhk.co/mowogibewu/ii0Jkhh/4433262356.pdfIn PDF document text
    • https://cdn.sqhk.co/sesumaku/chiid2y/carpet_cleaner_rental_home_depot_vs_lowes.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/42674767741.pdfIn PDF document text
    • http://mmeueue.space/programa_de_enfermeria_ambulatoria_y_hospitalaria_conaleplhxep.pdfIn PDF document text
    • http://marketitaly.info/vudimafutunawetakafulim3x154.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_e6d2de77a1404616b7c7fe1b3045be3f.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_3319b3120af5439cb90d6ef4e2fb5a64.pdf?index=trueIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_5937a165aa564953a39f94b69bc9c572.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_1bec6d2a40df4979b12f35c4d9ed84e6.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_81ba79ab84ba4a78835826be2ca35a2e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/powerpoint_templates_ndern.pdfIn PDF document text
    • http://nanaxidimidi.atwebpages.com/pharmacology_of_antihypertensives.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_1299909e86474336bf6786b1ef9649e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rumezo/calendario_civico_escolar_2019.pdfIn PDF document text
    • http://zexaxekiki.atwebpages.com/43385030348.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_7675ea7db3b14593b265cdb4cbb18505.pdf?index=trueIn PDF document text
    • http://tatesit.myartsonline.com/pokaxudidugadedosewosab.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF190 5568 bytes
SHA-256: c9e0156fa071a3154e9a5b127407ac2ad5bb0b87f379fc29f8907d75105e5e22
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 12516 bytes
SHA-256: 5f23eb3fe0df0892f0877259d9a09c3c21d688eb6b6c1fd7445b04f6a09b1ac9

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