Malicious PDF — malware analysis report

Static analysis result for SHA-256 01978313a37d6cd1…

MALICIOUS

PDF

73.7 KB Created: 2021-03-12 20:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 34c94b58f27ba7462747ebaa4554a8ae SHA-1: bb0b3182c2c66bd28eb888a63bcb642c0f54b55e SHA-256: 01978313a37d6cd1cdc57ff65a2d5af2830d3a883eedcc010ae7d20d220f1087
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily corrupted, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

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://seumenha.ru/award?keyword=future+will+going+to+present+continuous+present+simple+exercises+pdf PDF link annotation
    • http://help-verifiedbadgecenter.com/the_secret_history_of_the_mongolsqemxo.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/jhHB8jg/15887551678.pdfIn PDF document text
    • http://xesapuwax.mywebcommunity.org/mokefetenunikuxodojatabo.pdfIn PDF document text
    • http://agent-spv.space/employment_certification_letter_template_wordgz0lm.pdfIn PDF document text
    • http://porn77.design/nuwigob8b3d.pdfIn PDF document text
    • https://pebuxunuvir.weebly.com/uploads/1/3/1/4/131483235/goximebanagos.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/7iiU81k/veera_serial_star_plus_song.pdfIn PDF document text
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/9810838.pdfIn PDF document text
    • http://opros.xyz/799654720709vu1t.pdfIn PDF document text
    • http://yourcy.com/simone_de_beauvoir_espaoly3beg.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/2c6b66e5.pdfIn PDF document text
    • https://xekuvezenigut.weebly.com/uploads/1/3/5/3/135346982/kefuluwavera-munorewo.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/giwgipH/slimeatory_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/EhgEgcs/53451693066.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/kirapiva.pdfIn PDF document text
    • http://nesakud.mypressonline.com/81921182504.pdfIn PDF document text
    • http://oneplusonemain.xyz/c_technical_interview_questions_for_freshersa7ajt.pdfIn PDF document text
    • http://beamorem.com/29793761229odpwk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dce579ed-4708-43c3-aaeb-2c76a6268d78.filesusr.com/ugd/944939_6370ccc3565141cb82e061ead41f67cc.pdf?index=trueIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_2855f6eb09514be99a5f066f880a3a0b.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 5380 bytes
SHA-256: 932c61d3451ba53dafba329a5c02a29a96a5a59e0697f8e2130deef079f5d307
font_01_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 10704 bytes
SHA-256: ef8ea8b7fc374c2f2d8697a7df1c53fcf4e8ec9da72fe17ecfe2908df6f27a62

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