Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f370e7757f581b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 13:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bae904ca763b378d1b20b03c1d734d1d SHA-1: 34fd8e311fe442bd190acddd873691cd87db1f44 SHA-256: 85f370e7757f581b10cf30969c35ec5edef5192e401802467f5e7b8e81a820d1
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 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 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://barrospizzadb.com/uploads/files/bekipib.pdf In PDF document text
    • http://flexa.cz/docs/file/87507420141.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b5f966a679e79cf01321c96ce57491ea/41430011282.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/81026180620.pdfIn PDF document text
    • http://smirna.pl/files/file/9392958796.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/60674136536.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/21208731934.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/didaxugefufifekikax.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210912065401.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/gexufexodujeb.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210920_71AEB9AF64D0E512.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2408cb35---23954231971.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6143f170dcaff.pdfIn PDF document text
    • https://chsromania.managenet.ro/images/file/rinun.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/leviwuful.pdfIn PDF document text
    • http://hbaoge.com/upload/files/65979374569.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/xuvuvudovituteweput.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/12282294019.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/47686613508.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/22812718072.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/nizasubumibar.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/19139381418.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/35733579839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=color+sorting+game+online+freePDF 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_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 17172 bytes
SHA-256: 875b0009192345afbbab1d8b1f7189dc82056b11671fdd2cfe154b7087b81c0b
font_02_sfnt_off00011942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11942 10588 bytes
SHA-256: 96cedfae67b0394e26d708787a90d52c33f18af722c9e9841e610d3d7d2976aa

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