Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9869272931e755e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 19:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca9cf6dcf29d9b0d284b8f1724515449 SHA-1: 457e36f5319d79977b0b343b1e4ebf8ab75109ee SHA-256: b9869272931e755efeb3102a4d1d5a385b9d13c85c76b88909d0b44e32ceb9f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to redirect users. The PDF's structure and heuristics suggest it's part of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=juegos+de+tiger+arcade+para+android PDF link annotation
    • http://balbu.hu/uploads/news/file/faroketisakegusot.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/posuvalojomo.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/mopoguwu.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/90486484253.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/42741043040.pdfIn PDF document text
    • http://nktrading.qa/file/files/59341238842.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/55817310174.pdfIn PDF document text
    • http://grotech.in/userfiles/file/witebamu.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/78784691313.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/45285815138.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/zamimotatakukezatirupisi.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/8821952262.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/serezufuborobegododisa.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/sumitiladasoses.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614369ff60a26---segamivok.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/4265344264.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/fixubajofidozejesa.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/nefevufot.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/41888686826.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/gedomimawalimisagarojil.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/masowedigufigiwi.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/mozotukamojalasipefe.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/82445425524.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210916_498A6C28995629BD.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/15733264226.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_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 10736 bytes
SHA-256: 512f4bbbc0a8f977fc9e376c9ea31ccf5b37984943a6bbcbc49d6dd9875cf2f4
font_01_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 19644 bytes
SHA-256: bf02fadbc74dcaa9d81887ac1d2b5a6c74c4f5f515964e9c185f65371fe9ac65
font_02_sfnt_off000125f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1