Malicious PDF — malware analysis report

Static analysis result for SHA-256 9137e77ab8553051…

MALICIOUS

PDF

96.5 KB Created: 2021-09-14 02:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a6b6abcd9cf9d4455914a10b6b13cb9 SHA-1: 50f9351e03f121407485531eb10cdfddbc2907e2 SHA-256: 9137e77ab85530510f84fceeecc000aabec44cb914c6a937dee24de0019f3029
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://pvvc.cz/files/43271347422.pdf In PDF document text
    • http://elosc.com/upFile/file///ITX202109060223191529.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/vosililitepaxalif.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/zagepowomas.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/visariditoxogivutebuneve.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/sijagezivadodemok.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/kuxegogosatav.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/feninavudizuruko.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/54684989387.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/26942273514.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/36160838104.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/82218298700.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/darikewujukitowonaluwite.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d640b91e99---tavalaxuxiwaminimukopodax.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/85292557604.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/64886298990.pdfIn PDF document text
    • https://coevent.ru/upload/files/pasamiloz.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/8041930927.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/tifixexejijotadetev.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/24812232465.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/najuvukumamorovagelup.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/37318800031.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e6cf22940863a79f7bdfc9aa4bc9993/mexumure.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/texararikubufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=conjuring+3+free+onlinePDF 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_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 19436 bytes
SHA-256: d098f9eb14eadab7bd95aa70789676167061fb10101ea5e60029aabf6563e299
font_01_sfnt_off0001448d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA4 10396 bytes
SHA-256: 97011af8fbd3814a2634c42ac804a3ea083e503979fe82106a33c7706ad2aab5