Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57db57680c5ca51…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 16:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f28b793fbd5291208c98be97859670a SHA-1: ad7e4c4775aa06d1ae3e67d3db6e8022177b7625 SHA-256: d57db57680c5ca51eaf86a84c6c97ce11128be1132d5244dea9a1a7f22047e17
134 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to host a large number of links on disposable domains, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=scribble+rider+online+game PDF link annotation
    • http://eptesteplelek.com/uploads/file/90315578240.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/55371568784.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/44704290540.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/3792982409.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/47459143560.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/9935729053.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/67087291890.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/vovabegamirekis.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/zavaniz.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/26129287808.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/24264525905.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/46555917497.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zizopiwenuvafidojidebafuj.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d3bcecb76cf1e8212832f02acc0f29f5/34674418816.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/vorudodanaroraxapelo.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/58051957268.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/favuxoresebikuxafoludaf.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/fiwavaxudositib.pdfIn PDF document text
    • https://terracell.pt/images/file/67683116663.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/65198681416.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/67208777927.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5982b6a5---62700606889.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/gamebafitomigef.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/sejef.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/jarujobejiwotawobaw.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_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 18056 bytes
SHA-256: 5fefa4c328fcfeabcf62c696556b2215ed015c43bd76073cc47b3337b3edce23
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10660 bytes
SHA-256: 15663a0f1eeae0421bc955881df259bb11dfc83f3c53d7136e6a8094adb6886f
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1