Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecb17c791354a11…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 10:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fdea40639dd7a8bb2bed83821a8261a SHA-1: 478aa35daa5f0c307c38ccba586a0c3cfa1bbce0 SHA-256: 0ecb17c791354a111c4f8e32b70f11a6a33f3bb8a2c32cd7cd5a5a6aa3784d3a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://haiphongcontest.com/images/files/sazovupiduwaloribep.pdf In PDF document text
    • http://dreiseengrundschule.de/files/kobodigudaxasubufekofo.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/66629671342.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/14254886973.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/58605269712.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/pemuwovowesizadidej.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/konoxavasezuwira.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/91537594500.pdfIn PDF document text
    • http://orlickachata.cz/files/files/43342941404.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/91239710454.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5e8d14b1---49360401202.pdfIn PDF document text
    • http://apcmagon.com/userfiles/serodiriwagibome.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210914_10E8AF4DFBB557C7.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/laxopewo.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/fajejojevasid.pdfIn PDF document text
    • https://jurad.eu/files/file/52452456414.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161382f970f79d---35488403283.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/51843858973.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/kigukukegekal.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/15478754443.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/35300902763.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/bovutefukufoli.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/pazamikotatex.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/kiranizaranofa.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/89657856629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+cod+points+in+cod+mobilePDF 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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 18092 bytes
SHA-256: c0d685ade46b81c89b02f30dd108ccd2f6e52cf64e05e665bf7e1c04f03edb9c
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 10812 bytes
SHA-256: 80c6fe1e16185d37cfab949d908a3b0c60b29b6acdb1d2ef65e6dcf6e940bd00