Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37884a945060f47…

MALICIOUS

PDF

67.3 KB Created: 2021-03-24 01:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b75e3119949c0fadd84d3cd0735dcc8 SHA-1: 8ccc61a5274bd011d2dcf820230066c10ee419a6 SHA-256: e37884a945060f47f8d107742bfa55e8dabdcec4d958c6b280ed4cfb2ec2aa5b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=derivative+of+inverse+function+worksheet+pdf PDF link annotation
    • http://byt-upak.ru/what_are_venial_sins_in_the_catholic_churchmv7s7.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/heKihij/5_year_survival_rate_lung_cancer_stage_4.pdfIn PDF document text
    • https://beponuju.weebly.com/uploads/1/3/4/6/134626977/7133177.pdfIn PDF document text
    • http://discount50.pro/aquatic_ecosystem_sort1rxe5.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/hp_officejet_7310_all-in-one_printer_driver_downloadsorzs.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/c5idhcl/linkedin_mobile_app_dark_mode.pdfIn PDF document text
    • http://4338bacchus.com/lajudojaxazakafodijavahgebg.pdfIn PDF document text
    • http://axecheat8.xyz/57680151123fcaa1.pdfIn PDF document text
    • http://fruit-citrus.space/filmora_7.8.9_effects_pack_free_downloadq24a6.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/bk7yzZ4/vikings_ivar_actor_blue_eyes.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/biaWBhc/timeforkids._com_edition_3-_4_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/vewimidipiv/rihsXhj/lucky_coin_pusher.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/fgJGjdC/4570222033.pdfIn PDF document text
    • http://profibrend.ru/baloxaxu1qfme.pdfIn PDF document text
    • https://putebofodabisig.weebly.com/uploads/1/3/4/3/134368176/zoxufazojeked_fodoladewuxav.pdfIn PDF document text
    • http://sevastopol.sale/8720766650xc97g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/097ef5b6-5e08-437b-b826-28640d62a1b3/54606930533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b4e0e8-ff2b-4ba9-b0d4-9ebccadf39cd/definicion_de_investigacion_explicativa.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_off0000cb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5E 5424 bytes
SHA-256: b4c882797ba66ec2ba0b966c682a6d271cf89eae9852d9b8f155a4dd6aa09ffc
font_01_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 9924 bytes
SHA-256: 4014aa689f55b0b65e5a945d22359c7036d12c60ee3d0482b6b29ee859d1c804

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