Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b39b1b0e2c909b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 05:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dfbce4dd315983c7079a8ce321cd8a89 SHA-1: c5b6c109dbaa54996eeef6fa83e44789dc6ed1b2 SHA-256: b3b39b1b0e2c909b05fc5f1f04d2451defd11c6b08f0890ddc5ee123bc0ee3b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains. The embedded URLs, such as the one hosted on ateneoarbonaida.com, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d250384366---zomirujovufeliwepapovo.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qb9mor0o48atp292d1v222peup/70147244930.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/61176742654.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/lugavesavutuxegijenet.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/nobijezugawijevufizivake.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210920114817293.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/zogafimunamafu.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/42205357903.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/85603361223.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/66674280675.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/30469265053.pdfIn PDF document text
    • http://mobil-tech.com/files/94569597576.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/92395961619.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/8068178557.pdfIn PDF document text
    • https://cecprint.com/images/file/51128934222.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/39045961824.pdfIn PDF document text
    • https://papiratisk.cz/soubory/12040848392.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/75281285911.pdfIn PDF document text
    • http://househouse.it/userfiles/files/supadavibejulutiw.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/94430995795.pdfIn PDF document text
    • http://huiking.cn/uploads/file/010841351171.pdfIn PDF document text
    • http://skene.es/userfiles/file/gudolotisowibobarezixuwas.pdfIn PDF document text
    • http://195exim.com/datas/files/podexujifijojegid.pdfIn PDF document text
    • http://vitrine-prof.com/files/41896640978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=brooklyn+nine+nine+season+7+episode+11+watch+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_off0000d2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DF 11056 bytes
SHA-256: 6a04818a046e03e034440f700192403180c6431fdb307bac30b82174babebb9f
font_01_sfnt_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 17248 bytes
SHA-256: d093300b87764349d6fcf93a566c7cfe77c204048e9357e6f2067077eb3bd917
font_02_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1