Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5702199be9e858…

MALICIOUS

PDF

76.4 KB Created: 2021-09-23 10:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1acea82999e1f0c6f80b83036e46551c SHA-1: a0cee25ff42a8e64848478db2c5dba37ba3b54ae SHA-256: ff5702199be9e858346efc76d01ca69155d43ddd8a242946a04404446aefc981
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern. While no scripts were extracted, the presence of many external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=spoofing+pokemon+go+on+android PDF link annotation
    • http://lab4050.com/upload/editor/file/tumexizulelinamev.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/16064794029.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210908_08FEEAF3EEF5830C.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/karuvaneligebevelurovux.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109090252113063.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/5825279806.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/dopozediluwubojemu.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/90c31206d4e83953ca081a9836c1ba65/dafuwuzidotorixufo.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/41689268509.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lovopabumejirikabi.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/sabigezonekoluwagixovokax.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/dozadutarunujovirigomozo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/83973204598.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/90441698776.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66635861548.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16146fcb9defe9---62945445937.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/simipafiderexadal.pdfIn PDF document text
    • http://ipceurope.be/assets/file/49681117097.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/lemaxujin.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/kegidegedumivan.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/latogut.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/ronefabazev.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/14810113677.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/jesapugipazesisizapi.pdfIn PDF document text
    • http://synhbio.com/upload/files/ximiwaj.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_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 17968 bytes
SHA-256: 0bad331333c8a235e3cba08278cf638188d82687136919abe00db69340ffdb11
font_02_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 10696 bytes
SHA-256: ff10fcedd9e48125f8fb4fc46ac601dca51228bf5617e8a5c4fc23d6a68fb418