Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e150673d692dc61…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 09:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f532cf3977069d60d1fc6a3eacda5a18 SHA-1: 0e52d15cf07535c345efb0bfc187fa0bfda62c90 SHA-256: 2e150673d692dc61fe75a7798482ef7d7f44ed54f3fd499847f78e7afa28b5a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains multiple heuristics indicating malicious intent, including ML classification, ClamAV detection, and the presence of numerous external links on disposable hosting. The document body, though heavily obfuscated, suggests a lure for downloading a handbook, coupled with a visual download button. The embedded URLs and link farm heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/strik?utm_term=asm+handbook+volume+2+pdf+free+download PDF link annotation
    • http://romeita.fun/gidazcad4n.pdfIn PDF document text
    • http://termometr-medikal.site/numerical_agronomy_bookd2p7z.pdfIn PDF document text
    • http://bellissimo.online/tadofitumodemabamezitdwaaz.pdfIn PDF document text
    • http://nuverlites.online/dujadupitatigmv228.pdfIn PDF document text
    • http://voztrans.ru/kagobidolasineduliswj56.pdfIn PDF document text
    • http://gatorama.site/kazowazimijunevejiyu1mz.pdfIn PDF document text
    • http://bestplacefor.rest/zarchiver_donate_pro_apku4xil.pdfIn PDF document text
    • http://centerverifybadge.com/authy_android_application596et.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/pOKgihj/pododomis.pdfIn PDF document text
    • http://sodaapp.club/concise_physics_class_9_icse_solutions_chapter_5ebtzx.pdfIn PDF document text
    • https://cdn.sqhk.co/vuranataxu/eCjaHd4/co_secretary_of_state_periodic_report.pdfIn PDF document text
    • http://shoes-storie.club/is_it_hard_to_assemble_an_ellipticalu0afn.pdfIn PDF document text
    • http://dom-bita.org/que_es_un_estudio_de_factibilidad_tecnicacpe6b.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/hegg8gd/27476608283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_bd535b6753c4408b9047745cb61ae750.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_ab2d2b691a7144028b20ec610c718c12.pdf?index=trueIn PDF document text
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_9b739a05027a4f5eb1cc220f40e1f643.pdf?index=trueIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_e4e32f4882af41cf95cafb498e335fbe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1671785-77e5-4ca7-ab7e-9ee18c9fb44c/intermediate_classical_guitar_sheet_music.pdfIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_5414c9e3a564442abfe49b391a152187.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb233c06-a087-461a-8385-7a4a024434ea/plant_respiration_and_photosynthesis_lab_answers.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 5760 bytes
SHA-256: 073b45e0f7a1deaf9dc145be23cd8d83f95ab02a16483c6396f15041d7e02d16
font_01_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 11256 bytes
SHA-256: 6948e8eb409718b050ba9f1eab49d6ccf985ca55d115100a5bd9a5c98d359615