Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04f024104483e91…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 12:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c1a3582a468a2daae61c10431c4010b1 SHA-1: 5a5c20c7b233ae5700375ebcd2b4a18149eed52f SHA-256: a04f024104483e91b3384d3a93f6cdfc84034f58b82bae411f15eaad5ed22d7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the 'link farm' heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=how+to+screen+record+snapchat+chat+without+them+knowing PDF link annotation
    • http://thenext.pk/userfiles/files/xanonabonipavorolalix.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/77817911887.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/wegijikasewej.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/suxopawebenomolizawuvo.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/30045277261480816706b5.pdfIn PDF document text
    • https://pcetravel.com/files/file/gunimelipotalefipi.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/99981487448.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/38780595400.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/rareworasebufulilofikuwas.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/30187532795.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/wisetapakujagifulure.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/gutesokopivesigubeben.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/61240425381.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/lotapegoguk.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/jilurebopilejojisi.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/38104826204.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/25884264552.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/41088355360.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/94346858513.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/23794371829.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/23633488073.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/65232661583.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/42072042482.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://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_off0000aeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 11184 bytes
SHA-256: e4d163c9461396b443baa6e6dd748d74902f9259a19cc29de6a875b96b26d959
font_01_sfnt_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 16276 bytes
SHA-256: dc53f54f42e3c128e90bd57be7196539fa0950661cd0105042b5921960968110
font_02_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1