Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e67fe7dc7badd62…

MALICIOUS

PDF

78.6 KB Created: 2021-03-04 01:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7ec887ac02719566655fc5741b797e10 SHA-1: cf743a79baeb2b281a6162d7586152233b3e78fd SHA-256: 3e67fe7dc7badd62bbcfb37cf6ba43802576c2d426d33bba1e3fdd58d1cc156e
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which are hosted on disposable or suspicious platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

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://nipisod.ru/aws?utm_term=what+to+learn+for+game+development PDF link annotation
    • https://cdn.sqhk.co/kulobuwaxegu/jahiayw/nizirom.pdfIn PDF document text
    • http://pumba-timon.space/is_project_management_certification_worth_itfy0oh.pdfIn PDF document text
    • https://cdn.sqhk.co/zezegawutogu/gxEBKqJ/drawing_mastery_test_answers.pdfIn PDF document text
    • https://keboxatoxumire.weebly.com/uploads/1/3/4/5/134591907/mezadumazarugej.pdfIn PDF document text
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/tukojej-janaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/rhg3gcx/27067228334.pdfIn PDF document text
    • https://zugatuwedi.weebly.com/uploads/1/3/0/8/130874050/wolivepigex.pdfIn PDF document text
    • http://supsun-aero.com/cascable_android_alternativei3itc.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/hjhPghz/tetapikobomosapurikun.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/7DibCid/secret_code_samsung_j7_2016.pdfIn PDF document text
    • https://xajekegok.weebly.com/uploads/1/3/3/9/133997321/2983784.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/6450360.pdfIn PDF document text
    • https://boxizegovabore.weebly.com/uploads/1/3/1/3/131379280/6133834b1c961.pdfIn PDF document text
    • https://cdn.sqhk.co/nezipumosot/haPEign/car_wallpaper_hd_for_iphone_xr_red.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/D3nBjf3/buwepizikalekan.pdfIn PDF document text
    • http://forpost-electrica.ru/how_to_share_photo_stream_on_iphonedxgkn.pdfIn PDF document text
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/8851271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paguxesij.myartsonline.com/simuvukagedopuliwodazok.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/29304033002.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_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 5352 bytes
SHA-256: 738c4cf1e4c9ec3db0abf597b1b62c765025de3d2dcbc5a03f9964faf91a0c2f
font_01_sfnt_off000108e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E3 10612 bytes
SHA-256: a1be9d5219e8ec06d29808427b8af922647efa10bcd4df1c605886d031eeccc9

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