Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c5b7487c64066e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-13 20:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ea126fabb32c45ec03a7edc1e8ec9f3f SHA-1: 13278c11afd4e282ee0504372395ef6bbf604d76 SHA-256: 03c5b7487c64066e01a6bdea74d371a59c5ca5b1557787019a91f855c89feece
126 Risk Score

Malware Insights

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

The PDF 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 numerous distinct, disposable domains. The presence of many unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://turbooto.vn/upload/files/6399787389.pdf In PDF document text
    • http://bsbcarpet.com/userfiles/file/78780922319.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/96503411668.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/87484616663.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/19691690892.pdfIn PDF document text
    • https://buyafranchise.org/files/files/xanetozemuxofa.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/64396392311.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/85655404087.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/kelapuzilibamoxakoso.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/28626198340.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/mevipoxofubemino.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/71392041875.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/18380453201.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/komijazujusosibomev.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/xigejolabododorow.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/31474222458.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/nafozevovekula.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/su48bddpickmu01edqgja9tho7/30237601533.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109042249318441.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/83519874460.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/68376606032.pdfIn PDF document text
    • http://nfc.soo.jp/file/moxipowagi.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/19372092182.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/64481193061.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/felifapezidixosubipago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=where+are+android+settingsPDF 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_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 17628 bytes
SHA-256: 926733d87920a84dd052c0f84a4f35d5af5239841e91f156ac86b4ff16ac36b5
font_01_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 10476 bytes
SHA-256: 01c7d4ebcd02127518e95ccd33c009f3999c5415e8bff4eb9ac6ad3932bae9d9