Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ebee064f1f113d…

MALICIOUS

PDF

71.5 KB Created: 2021-01-20 02:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3b453813648c8983dbba8277b764f6db SHA-1: c304f3cf6089d08cd902318d0bc4e4a56fb89f2d SHA-256: 23ebee064f1f113dee8b6ba965748332bcb2ecb9fed1d80d62a276c5e456a7ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a site offering 'diabetic foot screening' information, likely a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the sample is part of a link farm on disposable hosting, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=diabetic+foot+screening PDF link annotation
    • https://cdn.sqhk.co/dixobiwi/WgikJIm/renamowose.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/3WhgehW/nujogu.pdfIn PDF document text
    • https://sijokazodile.weebly.com/uploads/1/3/1/4/131454207/4217b1f.pdfIn PDF document text
    • https://cdn.sqhk.co/vagewovupug/cgjhgit/slick_slime_sam_sui_face_reveal.pdfIn PDF document text
    • https://site-1174464.mozfiles.com/files/1174464/suzonimonugevik.pdfIn PDF document text
    • https://site-1178342.mozfiles.com/files/1178342/spin_the_bottle_truth_or_dare_questions.pdfIn PDF document text
    • https://site-1174852.mozfiles.com/files/1174852/bodice_pattern_free.pdfIn PDF document text
    • https://site-1168143.mozfiles.com/files/1168143/20773249195.pdfIn PDF document text
    • https://site-1250150.mozfiles.com/files/1250150/28812602928.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/LghgmB7/64548114090.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/wagokuxovelif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxawij.rf.gd/all_computer_software_list_free.pdfIn PDF document text
    • http://wikidupuzok.epizy.com/hogenakkal_falls_travel_guide.pdfIn PDF document text
    • http://pevurevakube.rf.gd/99439646201.pdfIn PDF document text
    • http://joretewad.epizy.com/blank_calendar_template_2019_august.pdfIn PDF document text
    • http://turijebudeta.rf.gd/tratamiento_anemia_ferropenica_pediatria.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_off0000daa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 5156 bytes
SHA-256: 46c2cd340c6a5a36af02f2375102a3aebbb6bd751f5508dd6bd899cb516278ae
font_01_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 10892 bytes
SHA-256: 3b455dd3f5847518841708cb80f8ede190d8dfe0b288152598ff93cb2aa3a5d0

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