Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c2c93c0be02d7b…

MALICIOUS

PDF

93.3 KB Created: 2021-03-01 05:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d36f445c81673ff4bb98276923457612 SHA-1: dbd6d6a2f7cc7f8d30e195cdaef44e1da3912740 SHA-256: b2c2c93c0be02d7bcedfd528d40e70e57dd62fee328af3c5e9f16d6d7b23bbf4
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm and uses suspicious links to external domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs point to domains associated with suspicious activity, and the PDF structure itself is flagged for containing invisible links designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://mezovuduw.ru/strik?utm_term=nordictrack+classic+pro+skier+parts PDF link annotation
    • http://enots.space/49469552045a9k4d.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/ac21f90a13200.pdfIn PDF document text
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/wamotumidozod_lexebalev_nujedu_xotefukewukerat.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/41503006067.pdfIn PDF document text
    • http://vquest.website/ts_eamcet_allotment_order_2018l0zba.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/1794074.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/masavilavuwfl1x9.pdfIn PDF document text
    • http://vostokzapad.su/how_to_reset_epson_l210_printer_ink_pad_is_at_the_end_of_its_service_life3e10p.pdfIn PDF document text
    • https://cdn.sqhk.co/pakelabete/ibjhieU/maz_pillu_marathi_song_download_mp3_mr_jatt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resilasijajatil.myartsonline.com/el_libro_vaquero_imgenes.pdfIn PDF document text
    • http://nununad.myartsonline.com/zutiluzaje.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/54962352700.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2F 5100 bytes
SHA-256: 85f1ec13fcd4bd716046cd0c2ca01adae91d18f50af5264a46306e2de575cc08
font_01_sfnt_off00013f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9D 12504 bytes
SHA-256: aa0f494a65c21b58b3e987c4aa24f4740f53acd2f987f23c472903fe453b11b6

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