Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62d76cae2a605ef…

MALICIOUS

PDF

76.6 KB Created: 2021-03-05 22:37:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a41df18d87109872ad54376ac1759f29 SHA-1: a127daa1a4c110057f2d6f6ad4a4fcda8c89e688 SHA-256: a62d76cae2a605ef710f02dae81b993bf7553e2d44f9d880eaf6530665d0b192
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure was extracted.

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://maypoin.ru/wix?keyword=licorice+half+life+lab+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485818/normal_6009080a0cc09.pdfIn PDF document text
    • https://gonibokufelari.weebly.com/uploads/1/3/5/3/135346176/6909289.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/865537.pdfIn PDF document text
    • https://tivofexogi.weebly.com/uploads/1/3/1/3/131398075/tefenisufivagol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_6014fa049ba9f.pdfIn PDF document text
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/tuxedeveneripeg_lageloritopeve_mirijadosewe.pdfIn PDF document text
    • https://ragurukenawuxif.weebly.com/uploads/1/3/4/6/134667210/181d6b529f05d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402507/normal_6002948e3f1a6.pdfIn PDF document text
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/c106f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467032/normal_602a8c06091c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450355/normal_5ff1054b5bd85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14368f67-1d78-42a2-aee8-eb89e45394ff/figurative_language_worksheets_2_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1417482-0520-47b0-809b-4f81830fb9be/28751094162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc750cdf-139e-4773-9db4-a099854ec27f/how_much_is_a_ps_vita_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25137221-fa2e-4111-982d-e8b931b3db61/27032367110.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/marketing_research_template.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/jesezudarejujumu.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/52988141633.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/53368892789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/986ba64e-ab67-404a-a760-edb83f9bcc02/tortora_human_physiology_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b332cfe5-50fc-45ab-934b-f3e5f89f39e4/68444172765.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_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 5308 bytes
SHA-256: 1bba49fba9d30299f8ac4044cf37ad3f2dbf80b2b64e728b35e632bfe69701c9
font_01_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 10944 bytes
SHA-256: 5e8bc1dabfd36e4f390b098ce635dbd5296a4d0887dc89b765494a69d9c5289f

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