Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bed6f396aa6ee47…

MALICIOUS

PDF

72.5 KB Created: 2021-02-22 04:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 179012180bff5c6302eb894a02718069 SHA-1: be67fc5000c31ee34417a002b3bc24c6e298cffb SHA-256: 3bed6f396aa6ee47dfb6590c0200d9b0c5324e5d2d4ea1b5b5d6918977368724
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high number of distinct hosts strongly suggest a phishing or malicious redirection scheme. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/wb?keyword=how%20to%20insert%20picture%20frame%20in%20word PDF link annotation
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/b4d685a4cd95e8.pdfIn PDF document text
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/9443113.pdfIn PDF document text
    • http://reflectionss.space/wallpaper_hd_for_apple_iphonezde40.pdfIn PDF document text
    • http://reassurez-moi-fr.info/duzagaziwetidalolokigontnmss.pdfIn PDF document text
    • https://borubonaxufiza.weebly.com/uploads/1/3/5/3/135318051/17344a244.pdfIn PDF document text
    • http://nncucuucuc.space/zojev13c45.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/9514196.pdfIn PDF document text
    • https://tedozumezefa.weebly.com/uploads/1/3/2/7/132740670/8915716.pdfIn PDF document text
    • http://custits.space/ed_and_ing_adjectives_worksheetrk0qy.pdfIn PDF document text
    • https://fogofude.weebly.com/uploads/1/3/4/3/134322730/abad8dc.pdfIn PDF document text
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/a3c34c23ba2.pdfIn PDF document text
    • http://216tilford.com/susidaosc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rufuregebedus.rf.gd/gevumelikewupupapututeveb.pdfIn PDF document text
    • http://nudifezidezi.rf.gd/extra_depth_fitted_sheet_king.pdfIn PDF document text
    • http://jalovunenenema.epizy.com/pct_applicant_s_guide_national_phase_japan.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_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 5320 bytes
SHA-256: 45ff9a5de0792363d38158a70555c1f10b985fd541319a0c88151be36e512916
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10688 bytes
SHA-256: 2ca233f2558e492990f1879bd125b763b4a0b707f2361dab4b80a3c8342a604b

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