Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcba794d9b5b042…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 16:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80890a792ab3e241cfd5f64da1836c5e SHA-1: 1deaf3afc60fcb785633a965d89b0d97b1512509 SHA-256: 8fcba794d9b5b0420f61fa8e3011b143a5137a21595bd78c57c4ce8c22b24157
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF contains numerous links to disposable hosting, suggesting a link farm designed to obscure the true destination. While no scripts were extracted, the presence of many unknown URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://98ing.com/upload/ck/files/20210919_041758.pdf In PDF document text
    • http://keitbg.com/images/files/16194493329.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/wazamemusapix.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/87830493861.pdfIn PDF document text
    • http://zenkatsu.dk/files/15457116549.pdfIn PDF document text
    • http://banquat.com/userfiles/files/dasadugitax.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/kegurukurakolulufopobomo.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/49698922353.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/45098712198.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/90362029092.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/mufenamirubim.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210914161108.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/webakis.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/46791184358.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/gowogi.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109080715292123.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/vakimoruvozukekegofod.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xinegabizedafisuke.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161455a2c3c499---vozotatezakize.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/lovowikotulegobumaxur.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/ranaxudexapewo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bkrq5mofje3ca8oprvh0f9jq0u/70477297241.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/lazazezefevexizaxijib.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/mesowiwejuvixed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+a+photo+to+jpeg+on+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 10852 bytes
SHA-256: 025a4862758e615976631610a0beeadb6dae309638ceb0e38e533f3522735983
font_02_sfnt_off0000df97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF97 14644 bytes
SHA-256: 52ee3347270304826b166b5b1d978a4256780d44ead91507a059a51961a7e0b0

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