Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b12d0196e04653…

MALICIOUS

PDF

76.7 KB Created: 2021-03-09 15:10:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c10ca2fb3d50b3928befbdfd5b3aaf91 SHA-1: 9c3bf8480de97d33103a0b6ce157ef750564181b SHA-256: 43b12d0196e046532d970f128024ab516af9632c6b2bc6e37a62ee5874fed4f8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominently displayed as 'https://pelibifir.ru/award?keyword=online+converter+pdf+to+jpg+in+600+dpi'. Heuristics indicate this PDF is part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

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://pelibifir.ru/award?keyword=online+converter+pdf+to+jpg+in+600+dpi PDF link annotation
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/a04b4debe9723.pdfIn PDF document text
    • http://podarokinsta365.site/korigozimupunakugifcamq5.pdfIn PDF document text
    • http://electrumwallet.buzz/74976972644hy260.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/high_fodmap_foods_to_avoid.pdfIn PDF document text
    • http://businesslinecenter.com/57579690328b1pgx.pdfIn PDF document text
    • http://usacreditscore.info/spur_gear_autocad_filezp0jr.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/hp_laserjet_4200_maintenance_kit_part_number.pdfIn PDF document text
    • https://xukonixivuki.weebly.com/uploads/1/3/0/9/130969652/25f6d53b819.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/formato_de_carta_poder_simple_en_word_peru.pdfIn PDF document text
    • http://wumiwuzigimo.mywebcommunity.org/nakodotawinos.pdfIn PDF document text
    • http://ulekschool.online/927459864762whir.pdfIn PDF document text
    • https://luxefelukij.weebly.com/uploads/1/3/0/7/130775337/8512899.pdfIn PDF document text
    • http://copyrightshelpscenters.com/lasubibofumig6wp8.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/xasevitexodokakozex.pdfIn PDF document text
    • http://nadahul.ru/muxomusejusafixuguvozaf72.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://bowegasobufur.myartsonline.com/komik_tokyo_ghoul_re_kaneki_vs_arima.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_1350fe4c0d234670af62d633e6e39aad.pdf?index=trueIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_9089722b08264ca4aa9e26adc633f656.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_95265e505139480fb24a05cfedd640ea.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 5180 bytes
SHA-256: 7d840acd8d63a05992971d482308c3fb06467e7f4862745f6818624ab84be927
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 10364 bytes
SHA-256: 15ab64f4e0ac3d609e7adec981ec3abded1c8eca51fcb155260fbe3817037272
font_02_sfnt_off00011797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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