Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a92e584af687b18…

MALICIOUS

PDF

78.7 KB Created: 2021-04-28 21:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b1cf2c524f51baf394aae1fd1141169e SHA-1: 9de02a2d73501b8be2d27a3cf9d3ad50c86f8127 SHA-256: 2a92e584af687b18e51cfe11b61c1685ff3f47c17b97f1d99e9b2ba65bcdf693
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 0.9993

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://soxebez.ru/strik?utm_term=my+60+memorable+games+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4424696/normal_5ff3874fa797d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_60333c3714354.pdfIn PDF document text
    • http://jogemijafiw.22web.org/milan_shopping_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_60560e2de7bcd.pdfIn PDF document text
    • http://myluckybet.xyz/aimpoint_pro_mount_looseningfpwlq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_60559f3d7e60a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_605ef5ce6ec27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5ff56ac96fd0c.pdfIn PDF document text
    • http://myyshooop227.site/pufolifm8ebp.pdfIn PDF document text
    • http://golosa-spasibo.ru/wagenedibokosinijimosama4v8ry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392441/normal_601aec725cfae.pdfIn PDF document text
    • http://antonioita.fun/71888775184mdl47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5fe7ad939fc70.pdfIn PDF document text
    • http://1s.london/calabozos_y_dragones_requiem_comicmueab.pdfIn PDF document text
    • http://item-get.top/wezovevewosifavujosibudadh4yzs.pdfIn PDF document text
    • http://prizinsta24.online/mubutawo0zfiq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fcc727fe7255.pdfIn PDF document text
    • http://sibuvre.com/the_misfit_of_demon_king_academy_manga_13y7k0n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jinixoxugud.rf.gd/37372202361.pdfIn PDF document text
    • http://rirusivinudi.rf.gd/91472796841.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_c41b369dae5c44ff8b1a82b1e015bcf7.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_f16ee053a9b64b109155cfa161df0424.pdf?index=trueIn PDF document text
    • http://perowal.rf.gd/verbal_analogy_reviewer.pdfIn PDF document text
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_ca9f4f5c44e4419c8bcb687271898749.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_9d8d5d6594f4464a9e21d034cd99d0df.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_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 5904 bytes
SHA-256: 02b1ed0d39b3479b4997036fcfb3c82aea5e394dfa6addb8d0aa897412d331ff
font_01_sfnt_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 11672 bytes
SHA-256: 95e8ae9071e61b302e7b7bec9a5bd9e130a1cdb293e6e94552831f0cc780a83f

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