Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ac4039c450b732…

MALICIOUS

PDF

76.6 KB Created: 2021-03-18 22:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1b4e1c03c6d1761059251125a4dd0d3 SHA-1: 16397fe47dd7101bde14562d4f1a72fad40dcccd SHA-256: 20ac4039c450b7327213bac92ae42636537cfc6179ee4a0823bffa7ac260700e
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 hosted on disposable domains, indicating a link farm or SEO spam tactic. The primary URL, 'https://xezojetit.ru/strik?utm_term=what+skills+are+required+for+managers', suggests a lure to a phishing or malicious site disguised as relevant content. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=what+skills+are+required+for+managers
    • https://rogasiwenebagan.weebly.com/uploads/1/3/1/3/131380029/rujejuvasis-lutekexod-pitofakuwurufu.pdf
    • https://zufuxanibagi.weebly.com/uploads/1/3/4/5/134586570/b8c0bf28df8.pdf
    • https://zideloxilatomi.weebly.com/uploads/1/3/5/3/135325243/fd6f9a6262.pdf
    • http://xepidenad.scienceontheweb.net/29258089058.pdf
    • https://static.s123-cdn-static.com/uploads/4492529/normal_6000fe04d0fa0.pdf
    • http://erkutungotu.com/51356622792o7vyo.pdf
    • http://mitimewigupito.mypressonline.com/articulos_dela_constitucion_mexicana_del_1_al_29_resumidos.pdf
    • https://cdn-cms.f-static.net/uploads/4427821/normal_6033e24861b48.pdf
    • https://cdn-cms.f-static.net/uploads/4417824/normal_602d55d7714c0.pdf
    • https://mixenabunagoxo.weebly.com/uploads/1/3/5/3/135320093/tazijowilagon_fufezasolilanin.pdf
    • http://mir23.xyz/metals_nonmetals_and_valence_electrons_worksheet_answersedb2p.pdf
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fe3ab27abdd1.pdf
    • http://batmbatm.ru/tenafobiveribamruog3.pdf
    • http://straponartist.com/hack_instagram_account_without_surve16dvr.pdf
    • https://gasomuvujutomeb.weebly.com/uploads/1/3/4/3/134356107/jozegadi_ruvelija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_7cedb6ed984e4e478a973761418c1985.pdf?index=true
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_a3fd6831a3514fed847cb3d577e18822.pdf?index=true
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_1bdd94d8b4444e4e90c4231cd168be2a.pdf?index=true
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_f7fbfc7a57634a8297e5c0050e668842.pdf?index=true
    • http://pimobepetokonud.myartsonline.com/anabolics_11th_edition_free_download.pdf
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_268caba7069f46d0aa6d7e11adc10f7d.pdf?index=true
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_4a72ae229cbf474c8b0d3ae4627d2d1b.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_34150ba4fb9a4369acf8faf8747786b6.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_off0000eeaa.bin
afc9c2aa023fbe4407d0733624ed0ed46fe9326020f99f5b06d66817b98f875b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 5524 bytes
font_01_sfnt_off0001014c.bin
0bb30c8fd09b786277c9be8daed1ac57e6c57c7281e92593a244e2aecbc18c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 10396 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.