Malicious PDF — malware analysis report

Static analysis result for SHA-256 7446aa23e5845be7…

MALICIOUS

PDF

74.9 KB Created: 2021-03-16 15:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ef740126bb441f0a4757be56017750e4 SHA-1: c3ba3da6a2607694b20b63cd9f95af06aa194008 SHA-256: 7446aa23e5845be769a51a9f1483d5ce499ad159187dcececc22e8b2e9dbd9bf
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be a lure for search engine optimization, suggesting a phishing or scam attempt. The presence of external URIs and the ML classifier's high confidence further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=buddhist+baby+boy+names+in+marathi+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479462/normal_5fe704b6c7094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_60199a4ae0b7b.pdfIn PDF document text
    • http://berkeciftci.net/florerias_elegantes_centrosi8olg.pdfIn PDF document text
    • http://gituwema.iblogger.org/wagekusaburawutokon.pdfIn PDF document text
    • http://bluetea.space/tcp_ip_layers_and_protocolsimq97.pdfIn PDF document text
    • http://urro-hu.com/mushroom_wars_2_cheat_enginej62ex.pdfIn PDF document text
    • https://xemexavowud.weebly.com/uploads/1/3/1/8/131857479/xidenolezata_nukugur_virigataxafakir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_601b0292783ca.pdfIn PDF document text
    • https://pofunowiri.weebly.com/uploads/1/3/3/9/133997400/44554bb193.pdfIn PDF document text
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/9769078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_5fdaf828eb0d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374983/normal_5ffb0e89b2eef.pdfIn PDF document text
    • http://center-about.com/acer_aspire_e15_display_price_in_sri_lanka6wl5r.pdfIn PDF document text
    • http://tugrull.com/97683933686mozg3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fe40240b16ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavavoju.rf.gd/kagokilejiduretominevakop.pdfIn PDF document text
    • http://nimozan.epizy.com/fuvufoduluganawaxeruzagi.pdfIn PDF document text
    • http://kepikinol.epizy.com/somewhere_from_west_side_story_sheet_music.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_46f8477c15bc4f9283cb9aa33550c11e.pdf?index=trueIn PDF document text
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_c14358a54dec48dcb85e28916c729b67.pdf?index=trueIn 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_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 5540 bytes
SHA-256: 3b1d09504164c0783c7fa1c614a04aefefa6be5f29bf8fc6a29616f8e880ba01
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 10888 bytes
SHA-256: 76e4c7fb03f442dacc2d672c42609c5a2441178f43a75ed03047f6a1cc4efffa

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