Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55762c25a287516…

MALICIOUS

PDF

75.5 KB Created: 2021-06-09 05:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 21987ce572a4d0913ad403e5d6bc97ef SHA-1: 6a4371b99b9bae19c309a8023b1240f8cda6ccbb SHA-256: f55762c25a28751636ccbe0097d43677363f91cba59f0936b5268034c618d831
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, suggesting a link farm designed to attract traffic or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/pbw?utm_term=romeo+and+juliet+1996+full+movie+english+subtitles+download PDF link annotation
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/1763453.pdfIn PDF document text
    • https://takogazaka.weebly.com/uploads/1/3/4/0/134017011/lamefifi.pdfIn PDF document text
    • https://kapofered.weebly.com/uploads/1/3/2/6/132680839/wibamekavanax_roxotifigejil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_602ef6703d0fc.pdfIn PDF document text
    • https://wolapegod.weebly.com/uploads/1/3/0/7/130776073/giparodi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427820/normal_5ff91b4ad6ed9.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/dozedisozagix.pdfIn PDF document text
    • https://zomedavox.weebly.com/uploads/1/3/4/3/134392748/mibanavugikigo_fobuxexitu_zedarigux_mazafaxunu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_60349521a6150.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/lowod_toruxifokez_xafepifelemipak_loben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60565ac6b1e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_6046b5106d6aa.pdfIn PDF document text
    • https://surejijal.weebly.com/uploads/1/3/4/5/134525532/3990606.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/eeda09ac-d942-444b-b598-3f6cf83a5a4f/global_history_textbook_9th_grade_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bff1f4-a2cd-4ebc-9f83-59b2a149b344/cook_up_a_storm_movie_download_in_english_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7adc70-f335-489e-9351-cc2beb876a10/a_discovery_of_witches_season_2_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdd44a26-f97c-425e-a51c-6c0c12798ceb/playstation_vita_emulator_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4c5a0b-f030-48fb-ba24-c5bbd8221b47/suzovotibagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54968d2-b4ca-4101-a941-ca11f1c0e4f6/nemoxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14a2fdb-4f4c-4003-a10e-a719b730315b/57496409975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc9a46f-91ce-4085-8602-41130bb82e0e/profesor_zellagro_horoscopo_diario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8d56ed-e99e-4d8f-93d7-c3c2e4fa8c9e/mackie_profx8v2_mixer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b003bfb-c9cd-45bc-aae9-5fd51b2e2db8/html_templates_for_education_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 5844 bytes
SHA-256: 193e96e5df15c084f322d68f8e6db4f3dcb390c44e358d8e1cbb541e3a674cc6
font_01_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 10260 bytes
SHA-256: 97ca30c5f83e1ee98ed297404f1bb3c21ee448412194188545f399f091e296f0
font_02_sfnt_off00011213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11213 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378