Malicious PDF — malware analysis report

Static analysis result for SHA-256 acaaa84e2d1fd137…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 21:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c52039f766ec9a6d89a75692690678d SHA-1: b5fb39082ed5a2968eea8ab910a032b8a15fe2eb SHA-256: acaaa84e2d1fd137b05f513a2e9179f460d0aa55fe6e4c1c300d445a42c3e3f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/kezurikijoteliwevapof.pdf In PDF document text
    • https://agermag.ro/mm/file/fozinazij.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/59933046011.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090305263373499.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/47396609004.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/pugobebo.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/xabafevefuzekefisirorow.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/zezuvuzanobe.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/sefup.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/viwavisevijalaxori.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/33856429466.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612feaa7d126f---jevefinimagomejomojepe.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210909054818.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/nojowupidawa.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/piwaji.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363c1929b94---peretipunowotibosozu.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/tipubajojarawakufobasa.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/jijidasegubuxujovoxo.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/21467933378.pdfIn PDF document text
    • http://saint-party.com/media/file/27794203456.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jenixemerefanebipewomatip.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nibisawoxikizof.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/vakogop.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/22842526227.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/73918155074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=every+witch+way+gomoviesPDF 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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10776 bytes
SHA-256: b311648e21d29b957824f9fa82b66b1c19b4f53ecd414f61ce90fb0171c859f9
font_01_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 18716 bytes
SHA-256: 61bb7d92c407c2f07c13a64309b5e2a3db4185626a552c234f531a96091db5b7
font_02_sfnt_off0001336f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1