Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c8e716aeb94663…

MALICIOUS

PDF

71.1 KB Created: 2021-03-12 00:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0191e4a44f0b0bbd26fe6d034ddcddbb SHA-1: a734cc078e6599cb25cfed92a345a85b5f1612e8 SHA-256: 41c8e716aeb94663d9db49422c7b296dd322062f089158c95f6fb20fee70c41a
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a malicious document designed to redirect users to harmful sites.

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://resalured.ru/123?utm_term=armonia+cromatica+edicion+pantone+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493198/normal_60343491ce4ee.pdfIn PDF document text
    • https://megopupe.weebly.com/uploads/1/3/1/1/131163834/zidozoto_femiwusufal_nonado_doporujokemula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_6005fdc3c32ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480749/normal_602a0c9569c13.pdfIn PDF document text
    • http://mujepojubum.22web.org/chamberlain_garage_door_manual_4620.pdfIn PDF document text
    • http://motirepefasake.iblogger.org/impulse_response_or_library.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/radum.pdfIn PDF document text
    • http://vobarijijagurar.22web.org/zajenexetosojupeti.pdfIn PDF document text
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/6201256.pdfIn PDF document text
    • https://dobamadolexazi.weebly.com/uploads/1/3/4/4/134478964/64000554d34482.pdfIn PDF document text
    • http://tedewirivotu.iblogger.org/drawing_architecture_book_phaidon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459776/normal_5fdc7c3e92e2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobisobopimab.epizy.com/33871042966.pdfIn PDF document text
    • http://mowadavukusut.epizy.com/40944855013.pdfIn PDF document text
    • http://nilipinuz.rf.gd/android_agenda_koppelen_met_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/xirogakonudorul.pdfIn PDF document text
    • http://xitemefunugege.epizy.com/2007_lexus_es_350_repair_manual.pdfIn PDF document text
    • http://kukuvil.epizy.com/iwatsu_adix_phone_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/fenner_plc_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/advanced_synonyms_and_antonyms_1_answers.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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 5432 bytes
SHA-256: cb39386b615f79b972ef1cd13af2a590f6b56306f5365d7cbd372108ce25af9e
font_01_sfnt_off0000e978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE978 11204 bytes
SHA-256: 4b96b8678333b280a4c7ccd73737f1e01c68ce7a9a83493f93bac1b577147c47

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