Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77990b68a233c30…

MALICIOUS

PDF

79.8 KB Created: 2021-03-28 09:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe89dd13f215595dc26dda7ef9d9b45 SHA-1: dbed18a0d3f4f32e2a026634f497fae41408460a SHA-256: f77990b68a233c30aa35677241a134e387cb00b0171675d1efac1ac0d4b0ade7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The embedded URLs and the overall structure point towards an attempt to exploit users through deceptive links, likely as part of a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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/strik?utm_term=les+trois+mousquetaires+2011+2+film
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff669a56f919.pdf
    • https://cdn.sqhk.co/jepogedofuz/eXDFkgf/map_of_countries_that_colonized_africa.pdf
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/sorimagoje.pdf
    • http://graatorama.fun/rinizidim89olj.pdf
    • http://lassituda.online/289766284956b9nx.pdf
    • http://mydenverneighborhoods.com/batman_the_killing_joke_comic_cbrhpitt.pdf
    • https://wepizowo.weebly.com/uploads/1/3/0/8/130813330/vaboxelad_gidobu_gipizixomunibe.pdf
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/wegegepuzuroz.pdf
    • https://cdn.sqhk.co/pefisemise/qhbieii/nujofok.pdf
    • https://cdn.sqhk.co/kenalutaxi/hdgd5ha/homeowners_insurance_ratings_consumer_reports.pdf
    • https://cdn-cms.f-static.net/uploads/4467593/normal_60514eacd2c27.pdf
    • http://all-host.site/my_talking_tom_2_mod_iosrwmb8.pdf
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5fe79b2fc949f.pdf
    • https://cdn.sqhk.co/vilosezuj/hfibVif/sogajexipori.pdf
    • http://sportplays.ru/pexivibojik5q6k.pdf
    • https://cdn-cms.f-static.net/uploads/4483867/normal_6058ed3b1c995.pdf
    • https://cdn.sqhk.co/tuzevawu/igihgSx/leapfrog_leapstart_3d_learning_system_books.pdf
    • https://vetetomo.weebly.com/uploads/1/3/4/0/134000119/4325308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_8eb96490c7c04812b121519486595cca.pdf?index=true
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_f20ca0adf07c432e981164ab76aea467.pdf?index=true
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_0b14171d8d2143ddafa07c4896b99d75.pdf?index=true
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_888984b5efb64a51aa816be1cc5f6c77.pdf?index=true
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_9ad5de81f81f4ea1bd2f611d5491b362.pdf?index=true
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_f3dad18cf2eb4b5c8bebb0b2a6a359b5.pdf?index=true
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_07da274a2ca54e429e383a1c9392ad27.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56b.bin
511708d9794e6f2e50af3da95f9941b15ed2ca3945b50847b6bb31b3c3247787
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 5308 bytes
font_01_sfnt_off00010768.bin
88b31c342eb805a321698d5f2a82460cbb32afbfd07c1609040e8baebe886df1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 13196 bytes