Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5122dfa661a2b28…

MALICIOUS

PDF

91.2 KB Created: 2021-03-29 13:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7f8c6501c1930ece1d0d7376c9057945 SHA-1: abdfb3a03ab9688402b2f31b316f260d4fcd8468 SHA-256: b5122dfa661a2b28f0b19199be64e21c00dc04077ffacb6e461fb8c2cd6eb71a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=commonly+used+items+in+the+1960s+and+prices PDF link annotation
    • https://felezawobo.weebly.com/uploads/1/3/4/8/134896203/nebutagu.pdfIn PDF document text
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/wupesib-wugaminulif-jifebewisigowu-tutazalobupa.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/HwjfNSD/vudelepumedukovoma.pdfIn PDF document text
    • https://cdn.sqhk.co/xugavizira/bjibogg/photo_cropping_tool_free.pdfIn PDF document text
    • https://vuduzilir.weebly.com/uploads/1/3/1/8/131857383/vofese-voxilesuzijoki-wofaremezek-dawonezima.pdfIn PDF document text
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/d1bbd5.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/mipunuf.pdfIn PDF document text
    • http://gratoraama.website/neil_labute_female_monologues40eiv.pdfIn PDF document text
    • https://resafuki.weebly.com/uploads/1/3/1/3/131398359/belurojez-xisapexeduvuk-rupepavororopuf.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/xidabekifa.pdfIn PDF document text
    • http://generalmassage.online/big_data_analytics_singaporec78ye.pdfIn PDF document text
    • https://malitizume.weebly.com/uploads/1/3/4/0/134097131/jegunafoges_vopavekuka_vusejigujodeme_boluwigex.pdfIn PDF document text
    • https://sozogamawi.weebly.com/uploads/1/3/1/6/131636736/rimos-gavuzunomusovow-vulamupa.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/jidiiib/the_hundred_years_war_on_palestine.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/zitukojodazijetitad.pdfIn PDF document text
    • https://guzezetuxavipub.weebly.com/uploads/1/3/4/7/134765233/tetotapeb.pdfIn PDF document text
    • https://zavurebugefogoj.weebly.com/uploads/1/3/4/3/134397626/60120.pdfIn PDF document text
    • http://seamanygau.best/kaun_tujhe_yun_pyaar_karega_song_dowe1z7z.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/adfa7dd3-8a52-4d3c-a8de-a03c2055c981/47643533492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab92232-0409-47c5-8301-c8e9f650b065/92418380087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e88a139-5e0c-48ff-84ed-4a71d3c7ecb4/el_pequeo_vampiro_en_peligro_libro.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_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 5824 bytes
SHA-256: f8309ad6714d4dc6a63464c2c8e8ede3e9654d574f7e49efc7fc659533aa698e
font_01_sfnt_off00012b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B91 11024 bytes
SHA-256: 5d1448124a72859d04713c8dd56a8a8337b7ccd5f148de9691685b2c39c8345d
font_02_sfnt_off00015115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15115 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3