Malicious PDF — malware analysis report

Static analysis result for SHA-256 d507d3be3e53cd16…

MALICIOUS

PDF

92.0 KB Created: 2021-09-13 05:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f874ead6c5b10f09a72feac329e47f4 SHA-1: 29aaf7bddbca15f51bfb1054c28f20191253002f SHA-256: d507d3be3e53cd16f3eb316ef92cf0b4eacc840c1a6a7287d820c607318ec533
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. Heuristics indicate it's a link farm and a phishing/trojan disguised as a download. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=download+aot+fan+game+mod+apk PDF link annotation
    • https://tractorpulling-emmeloord.nl/upload/file/bupevapejo.pdfIn PDF document text
    • http://stylekd.ru/files/16986691812.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16136d08d847a2---xofazejewadanutidebeb.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/waxina.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xabulevuzejopigudejo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/sarukukoxugotupedogore.pdfIn PDF document text
    • http://change4best.ru/upload/file/pelig.pdfIn PDF document text
    • http://ranch.pl/files/file/13967266047.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/94009426082.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/sanurizi.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/5823774222.pdfIn PDF document text
    • http://chemicalengineers.ie/images/46990799932.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/vafubusimavi.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/23145418720.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/21780455860.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/sunevabe.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/kekas.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/kazuzeka.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/94692282803.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/nijaronokixofomamitu.pdfIn PDF document text
    • http://parfumland.sk/upl/wakobik.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/53158822114.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/raluwukedovepigobapotas.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 22712 bytes
SHA-256: dd93320be9e36a78e44071cf3dd6934cd7971f72ca2eb9d59d9fa3e008a255ff
font_01_sfnt_off00011bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD3 10660 bytes
SHA-256: 55c81b9dc0da170cb10c0288d9cab8af1c3d6cd7324745324731f114e1325bf8
font_02_sfnt_off00013412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13412 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_03_sfnt_off00014989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1