Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a51c57f730f0ddd…

MALICIOUS

PDF

74.4 KB Created: 2021-09-23 22:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 238334d534b9f9f7aede47573d3e2ff9 SHA-1: c07699b568b1628856fa1496bdd20846f2b6fd72 SHA-256: 0a51c57f730f0ddd25042f1f50786e01d8a85b5a6ee62beefcbaec386776834b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, potentially for SEO manipulation or to redirect users to malicious sites. While no scripts were extracted, the presence of many external URLs, some pointing to potentially disposable domains, reinforces the idea of a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://geombiagioschettino.eu/userfiles/files/22400543413.pdf In PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/80170117068.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/zixoledu.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/sesijolowabozovolu.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80528889012.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/60087242092.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/jiganotofugine.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/946fb3fc5465bd0f08ea0cbd2b37e6c5/bagasaduzurejuvof.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/nopubesipi.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/9973498065.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/gobubivodalub.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/luwimawup.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/dewezowowunemakijo.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/72130092569.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/xiluzuvarupetokidosiruzoz.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161389564d5258---dadekexonu.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/jidimetajejavakakalix.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/lejuwaxajuravoveluxa.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/67750062122.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/20811559473.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/63407063484.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/tebebevowesuk.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/56109389334.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/vofamuserigemipez.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/janatu.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/wenabitinotodasopokul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sonic+2+beta+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_off0000be3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3D 17620 bytes
SHA-256: 673dfd5150062c0ed05b866cf123887c6208f4e65c790710cd188f5f19cd19c7
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 10480 bytes
SHA-256: 731feea33ca9071fcb7a763afa8da7dbf6cb943e7565be63a09dc77b39b13027
font_02_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1