Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2fb2fc93246a68…

MALICIOUS

PDF

82.3 KB Created: 2021-04-07 00:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cfd86133d28c010c7ae6e5994f1f451c SHA-1: bec7c38b5c27dc35ab3e0177057eab180478c33d SHA-256: dc2fb2fc93246a680ffada06272eaf441bc725f92960cb3bce2eb86ab64e3ac6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one prominent URL leading to 'lozipotod.ru', suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Google sheet online course' and 'wkhtmltopdf', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://lozipotod.ru/123?utm_term=google+sheet+online+course PDF link annotation
    • https://cdn.sqhk.co/xabiximakef/hd96wPA/suwuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450440/normal_5fdc22c28f4da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_606c7b01eb987.pdfIn PDF document text
    • http://guzolemidova.iblogger.org/pokemon_soul_silver_nuzlocke_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/iiRe6LI/19483154106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_60539a1c9e182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_605033b720b29.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/hie649m/calculate_percentage_excel_mac.pdfIn PDF document text
    • http://nutosuvitiraj.scienceontheweb.net/how_many_batteries_in_apc_smart_ups_3000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417040/normal_60044946e522d.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/which_countries_does_north_korea_border.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/biosystematics_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_605c5797dbc8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_602270f5f0919.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://s3.amazonaws.com/dazuxujepov/rajuwopojuxawituwuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/old_school_pizza_avon_lake.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/what_does_yahweh_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/lux_guide_pro.pdfIn PDF document text
    • http://titanoge.epizy.com/roxepamuxevepijenur.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/98564548373.pdfIn PDF document text
    • http://dawejur.atwebpages.com/tratamiento_desequilibrio_acido_base.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_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 4764 bytes
SHA-256: bde775ac7d12bb695e988244a57bc151061cea4b07dd042ed87f552d8fce8d36
font_01_sfnt_off0001085c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085C 11636 bytes
SHA-256: 5baaf41703e0c3794de65a965563d4c71eeee82ddba038dafffa89be67466b92
font_02_sfnt_off00012e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E22 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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