Malicious PDF — malware analysis report

Static analysis result for SHA-256 3581971d1e46dd51…

MALICIOUS

PDF

76.1 KB Created: 2021-02-27 05:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4b1446357f1586ed974c4682073b14e1 SHA-1: 51d811684651e574644e01519d3813858349f734 SHA-256: 3581971d1e46dd5187b223c2df380fa517ee8bfceffac324323feb546a0474fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://zajinet.ru/wix?keyword=correctional+officer+job+description+resume PDF link annotation
    • https://cdn.sqhk.co/pefisemise/kiabJjb/zombie_chase_game_online.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/riwexotubuxasupevufagem.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/x1_dvr_box_dimensions.pdfIn PDF document text
    • https://dosupara.weebly.com/uploads/1/3/1/3/131380612/bodaluwenugisewew.pdfIn PDF document text
    • http://show-visitor.xyz/99997626610hyaim.pdfIn PDF document text
    • http://helplnstagram-confirm.com/brescia_calcio_formazione_20015csp4.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/3943268304.pdfIn PDF document text
    • https://ruwatavefi.weebly.com/uploads/1/3/4/7/134704280/2175495.pdfIn PDF document text
    • https://cdn.sqhk.co/nepopagugela/j2rjgjf/screen_recorder_for_android_free_download_apk.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/3a8d7db.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/kudekegolesalexanigetoahe66.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/896b401aa4.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/fidQ3ox/sunshine_house_resale_store_sturgeon_bay_wi.pdfIn PDF document text
    • https://cdn.sqhk.co/zoturisa/Ngehdib/47767682962.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/kuvoboxivababatawififofu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirotowukutizu.epizy.com/vobobobimufawiderinewabot.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/holley_hp_efi_tuning.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5424 bytes
SHA-256: 1106c36a8f995ba9ac02604db5a23ebff4ae5a78e716a8927569782b94e38d0d
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 10172 bytes
SHA-256: f1843af8f60d0151b21857011c9707667b9216157c47ae2d23bfa4af4e5f5223

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