Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0f5b5b8a714660…

MALICIOUS

PDF

106.3 KB Created: 2021-02-15 09:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e8013f563041006f8ba06f960a456c0f SHA-1: b2c8b4c874ee046da8776e370d5dd020500a5619 SHA-256: ce0f5b5b8a714660031a144e6d739c2a91bc8f699ddbd05210a98a276b62cd4c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=in+my+own+way+alan+watts+pdf+download PDF link annotation
    • https://cdn.sqhk.co/tumosirewuw/6qkuigd/panda_jumpsuit_dress.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421627/normal_5ffcaa78944f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_60121ae5a4f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_601b8b50d54e0.pdfIn PDF document text
    • https://xateboduf.weebly.com/uploads/1/3/1/4/131483383/kakowerewij.pdfIn PDF document text
    • https://cdn.sqhk.co/gulijolane/GNLjj7J/photo_video_maker_app_online_play.pdfIn PDF document text
    • https://cdn.sqhk.co/rebiguta/0sdI89B/extreme_speed_car_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_600e49b437b25.pdfIn PDF document text
    • https://tijikazi.weebly.com/uploads/1/3/4/3/134373218/sitolof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451375/normal_5feb9977990a1.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/dizito.pdfIn PDF document text
    • https://cdn.sqhk.co/wapuwozelob/U4ibcWp/flappy_bird_apk_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/nabixisaf/ifjbggE/33821820260.pdfIn PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/4683848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/7124239275.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/didojexezogolotifigasok.pdfIn PDF document text
    • http://wofaketizezoja.epizy.com/manual_archive_outlook_2019.pdfIn PDF document text
    • http://ruvatarojamun.rf.gd/adobe_photoshop_express_cracked_apk.pdfIn PDF document text
    • http://gadusevi.rf.gd/boutonniere_deformity_tendon_repair.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_off0001645a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1645A 5220 bytes
SHA-256: e74300e33464540a05af7d1ad501d5c2abebf103da0cd4e276e885a8618aaa82
font_01_sfnt_off00017629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17629 11176 bytes
SHA-256: f920270139efbd7c9419ef80412a02f814fafd878806aa3aa91a108efc588879

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