Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d070bbeba3e3f7…

MALICIOUS

PDF

77.2 KB Created: 2021-09-09 14:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 781b466a58c3addd90ded33268832f4c SHA-1: 7c963984ee38df00923efe1d974501035360bb4a SHA-256: b2d070bbeba3e3f7116a0c9f9e9d65ce3ba8780c1daf481623ba424de24604a5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent to trick users into downloading a password-protected archive, likely to conceal a malicious payload. The presence of external URIs and the link farm heuristic suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://infrive.ru/uplcv?utm_term=apk+download+messenger+lite PDF link annotation
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/lilitaviwuduxamoki.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/39826391285.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/wowukoru.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/98005073008.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/guvedomisulubapopakipinim.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/30456888659.pdfIn PDF document text
    • http://artospace.com/pics/file/79025081313.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/66238482954.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/62981247230.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/pagikesenof.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613959e448066---bazazivaka.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/xipadelakuxezaxujogofata.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ef3e69f9faae456b779b181a9110c6ac/41509078865.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/25110014464.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/sapaxegidupag.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/92744180004.pdfIn PDF document text
    • http://gotween.com/userfiles/file///82685601463.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/14342870266.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/25572897267.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/wodenokofebera.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/salumozidarasonumunikama.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/nisosu.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/woxoka.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/nakilogut.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/72183303973.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_off0000ca2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2A 10896 bytes
SHA-256: 489b7125a36863ad553fde6d71f3e1b7211aacc042e30894513a2d4772251c81
font_01_sfnt_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 17076 bytes
SHA-256: 000ca792f9654f68dac5608cffde76668e236f9afab06abf75c1030e4090f4b8
font_02_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1