Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a70341ea9bbb6b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-22 16:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8d28ef0658daa315bf4eb3f527ee9b8 SHA-1: c1cf7177bd1a0bde6c013ac992b1dc9211850fbb SHA-256: a2a70341ea9bbb6b9a65c1880ac91966dd7ac56fb0348bd94abf3130aab6fa6b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and the ML classifier indicated a high probability of maliciousness. The 'SE_MFA_LURE' heuristic suggests the document is designed to harvest credentials or abuse multi-factor authentication. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack, likely leading to a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://saiprogetti.net/userfiles/files/71398420156.pdf In PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/vuwabogejakok.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/votiferojuninoruwi.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/12546163117.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/nirogukuwuxakoniwegodu.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/10243397775.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-20/20210920042206389520.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/62537877824.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nozenuvo.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/tiwiremubevib.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/49276139769.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/jotet.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/14857552202.pdfIn PDF document text
    • https://projetovm.com/uploads/files/12103598983.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/80506145243.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/89716408468.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149f671eb58d---varerutatav.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/foted.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/32510046427.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8b0af9db---38360213782.pdfIn PDF document text
    • https://31app.com/userfiles/file/xojokasaw.pdfIn PDF document text
    • http://taigesw.com/upload/files/fomoxolarukam.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/dulerirubenizelupo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/85805990879.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/vipoveti.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/pewavexitonatinugu.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/24926969332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=telegram+last+seen+tracker+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_off0000c390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 17792 bytes
SHA-256: 23d0afdd1432faf0c7d35b8e34f7587ced91c31095cb092ceeeb3d0b07d79e32
font_01_sfnt_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 10628 bytes
SHA-256: cbf4a5c4589a352ea25ae0fc1a87ce98b65438c6f5aeaed53a08f692b08bdd6b