Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b8258e346e8347…

MALICIOUS

PDF

88.7 KB Created: 2021-03-04 13:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dbf395e7f0d0e8ee7b9f8356b48bfe83 SHA-1: d8dee0741e5ae8514729ead1bac22cdececa660a SHA-256: f2b8258e346e83471f24148b336f31ac86ae2ee8208f35c758fb1f14c3a666dd
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 manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://midufefew.ru/strik?utm_term=skill+set+or+skillset+ap+style PDF link annotation
    • https://dugaposiga.weebly.com/uploads/1/3/4/8/134857723/dojeguduti.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/2eee0f66a.pdfIn PDF document text
    • https://vanibupawu.weebly.com/uploads/1/3/5/3/135345935/1885db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd732cf83f89.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/b2ed662b2d.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/havQhdN/kavixinejabelovefarej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369643/normal_60093e5d666f0.pdfIn PDF document text
    • https://dudisavaw.weebly.com/uploads/1/3/1/3/131380109/821150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_5fd81bd35372e.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/agudas_graves_o_llanas_esdrjulas_y_sobreesdrjulas.pdfIn PDF document text
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/zewojomofimid-lakemezi-nufulotebaw.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/jupavafesaj.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/jajcYgi/doxawupaxavuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/gyNngg6/90659975706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_600ca7f801797.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/hfij4hf/64354354206.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
    • http://zafuriket.rf.gd/clash_of_clans_apk_day_son_surum.pdfIn PDF document text
    • http://gugawojakopa.rf.gd/fakapapufolepudopiza.pdfIn PDF document text
    • http://bitujiduruv.myartsonline.com/audio_technica_lp60_bluetooth_speakers.pdfIn PDF document text
    • http://fusuzuveraku.epizy.com/how_to_change_apple_watch_4_bands.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 2940 bytes
SHA-256: 5205dc029b2d4b0ae44ddd8c96d056e1801b9f6b3c115db4e44038fa36e83b83
font_01_sfnt_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 4764 bytes
SHA-256: a5702999c57004e44875d07e37b77b1d6b1eaa4c1107bb693d88c474e4594c68
font_02_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 10488 bytes
SHA-256: 612a4dc2025c268a75cb8b441c0438696eb4c603474ee7060e84f270b47e45e4
font_03_sfnt_off00014659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14659 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34