Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f4a9dec3800dbf…

MALICIOUS

PDF

80.6 KB Created: 2021-02-22 01:39:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8d1c5750392d8d29f83ae6bf6290fbed SHA-1: 7820f7e6207b60fd3443617683b76cd1b1f0697e SHA-256: 44f4a9dec3800dbffc26dada9e72de7b59e4eb1ba4efebb6918ca5005d2c2de0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title about brushing teeth, which is likely a deceptive pretext to mask the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=how+to+remind+yourself+to+brush+your+teeth PDF link annotation
    • https://cdn.sqhk.co/lilaxikixo/DugdzwV/wewojirebaz.pdfIn PDF document text
    • https://cdn.sqhk.co/nedabuke/hgeXjcF/maromexigizusuji.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/chhfAjc/61790468164.pdfIn PDF document text
    • https://tusopapa.weebly.com/uploads/1/3/2/7/132712380/fupasutapomena.pdfIn PDF document text
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/bfe0e185a96a18c.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/dUwWNyc/raid_shadow_legends_adjudicator.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/fciiyjC/supply_house_times_rep_of_the_year.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/ihjnggi/chicken_invaders_3_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/lilajibusizu/E5ihizA/61600149346.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/iehgwp8/ivan_the_terrible_and_his_son_poster.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jagfgga/international_midwives_day_2020_nz.pdfIn PDF document text
    • http://bestita.space/best_windows_launcher_app_for_androidsvrvv.pdfIn PDF document text
    • http://nanolenka.xyz/70016077841fynzs.pdfIn PDF document text
    • https://cdn.sqhk.co/rabawula/NjhhaF1/baby_alive_baby_grows_up_doll.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/nogiwo-binipes-golunenof-gilumowid.pdfIn PDF document text
    • https://gusujosu.weebly.com/uploads/1/3/0/7/130775940/mexogezawoj.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/jhshiyC/the_topup_store_ltd.pdfIn PDF document text
    • http://logoped-samara.ru/nutrientes_antioxidantesoqp09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 5232 bytes
SHA-256: 4de9e03534f8a98761a064818ef57cb84f72b9aab79ea01dd0db57b93b702531
font_01_sfnt_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 11256 bytes
SHA-256: a0930b59e5fa71626159d3b5ddec840bfa07265cfb731ebe54224e133eab72ec

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