Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7a7f4f9b2dd05e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 17:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c1b124e5c43a583c0686d0499dde8caa SHA-1: 528bb34163313690ef309b85bbb6a5864c22b9a8 SHA-256: 8b7a7f4f9b2dd05e7cd845ecf51a86c1096d8e594deb08db50af900ba18f922e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to other PDF files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download an archive, suggesting a phishing or credential harvesting attempt. The embedded JavaScript and the nature of the links suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://apra.pl/files/file/zidonatafamagurokuzapek.pdf In PDF document text
    • http://lex.tj/img/file/sumigejije.pdfIn PDF document text
    • http://skomi.ru/img/files/file/52651825133.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/somapekeli.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/belagixegape.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/paninusafonenejona.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/93306755247.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/sadolowosurodipu.pdfIn PDF document text
    • http://polipack.ru/content/file/89698812146.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/wexanupidorudefunixe.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/regujadosetizotabu.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/98403040447.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/872168756.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/narigofuzij.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/ditusevugizupoka.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/JBSVds4anrf5.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/natefuduzebake.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/47267824327.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/fogexorosovuvod.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/pekiteti.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/kikomik.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/zarevemijokoverekapapeb.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/88513568262.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/vixerebijulukonudoje.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/73791380730.pdfIn PDF document text
    • http://93564497.com/userfiles/jugedovinemidebazanif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=z+archive+apkPDF 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_off0000be72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD689 10056 bytes
SHA-256: 658ebe0f091ffe2901af171fb557273223d623fc9d5df4331e5355e97485976b
font_02_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 17568 bytes
SHA-256: 953b9478ae3216f5e8870ee3f3e39c7003a4cda761dcce83469e32b0da16f841