Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a8cf25a7921cae…

MALICIOUS

PDF

67.8 KB Created: 2021-09-30 10:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3dc8ef45518eee7d5bcde143aae120c0 SHA-1: b4ce8c7333c0e9139de955ba3603ec53b3bfb2fa SHA-256: b7a8cf25a7921cae81db66499975ffddfad12cfefa831272927928e1df2915ce
146 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document with a clickable action, typical for directing users to attacker-controlled URLs. Numerous embedded URLs were extracted, suggesting a link farm or redirection mechanism to a malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://educasters.co/ckfinder/userfiles/files/26867143274.pdf In PDF document text
    • https://davnosti.ru/upload/75935242680.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/39576712089.pdfIn PDF document text
    • http://espicycooking.com/files/file///mivomo.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cf1ba6e631d1415e178153ed9d344537/lesapomapuroviwokumadogo.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/muxizene.pdfIn PDF document text
    • http://palami.by/images/file/44808479497.pdfIn PDF document text
    • https://tdfstore.it/file/42023018025.pdfIn PDF document text
    • http://yepuco.com/uploads/files/wejosufibebip.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/91893696454.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/50384356527.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/favizomerab.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/50223786933.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/78858858484.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/zapotomorulakewa.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16148f9781c427---pubidararirimifapegija.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd97b0e51d---zujupapoki.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/tanepenegonolojezuza.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/82277400609.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/tuxezetulo.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/41509199461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=robux+codes+2018PDF 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_off0000ad33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD33 13876 bytes
SHA-256: 1b9a9d0a6f08ac3510f18e314fdb7b9fea550ca42ab7ae425f484c4b2249a626
font_01_sfnt_off0000cf83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 10648 bytes
SHA-256: 153eb39579e5ff6a2bbc71c8d35711b40bdec3303db9ad367733e9aa3681a375

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