Malicious PDF — malware analysis report

Static analysis result for SHA-256 812528b2d188318f…

MALICIOUS

PDF

94.5 KB Created: 2021-03-23 23:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 727fcad4250a4f6aa69accd068c0847b SHA-1: bf93c5baf7ac15446926fb8293b8fa18f466b656 SHA-256: 812528b2d188318fbfdb249e3c60ec90859b45d9645a29fa9872924296a00991
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URIs pointing to external websites, with one notable URL being https://bologen.ru/wix?keyword=rwby+jnpr+death+theory. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of external links suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=rwby+jnpr+death+theory PDF link annotation
    • http://sethel.xyz/dikenuxepu34zz8.pdfIn PDF document text
    • http://asta-stroy.ru/histria_do_futebol_feminino_no_brasil_e_no_mundoi2m9t.pdfIn PDF document text
    • https://xenonomexe.weebly.com/uploads/1/3/5/3/135386884/f27d6.pdfIn PDF document text
    • https://woxumonukoke.weebly.com/uploads/1/3/6/0/136090180/mejazogotuvo.pdfIn PDF document text
    • http://xabidewukolesas.66ghz.com/bee_bot_app_for_android.pdfIn PDF document text
    • http://mijuxub.66ghz.com/xukoduzeluzamuledizu.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/wutufo.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/fakowixobevuvozawilupobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e1a6dee6-c0d0-4e0b-8888-dc4885740609/5562213855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ef3d55-7888-4183-bc86-f2d3b621eef1/zalajiwoti.pdfIn PDF document text
    • http://kupuwatuz.epizy.com/mezibekisiluvezimamane.pdfIn PDF document text
    • http://lewozato.epizy.com/unequal_childhoods_chapter_3_summary.pdfIn PDF document text
    • http://fefomuk.epizy.com/59756027992.pdfIn PDF document text
    • http://zulexesovo.epizy.com/arcade_fire_her_sheet_music.pdfIn PDF document text
    • http://zotubetujuna.rf.gd/30607654855.pdfIn PDF document text
    • http://zibozepor.rf.gd/4806896297.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/what_to_do_to_get_real_estate_license_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76be4679-01c8-4a23-b5c1-e44de9cebccc/midsummer_nights_dream_act_3_scene_1_short_summary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001292c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292C 4996 bytes
SHA-256: 4c2f364e16b93be81c981407613a3f31bf6b3c6f90371710543d51fa4ddc52e0
font_01_sfnt_off00013a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A29 10816 bytes
SHA-256: 195b981865e9d6aa8720050184ec3af3510eef5d38569ea474058827ab67e727
font_02_sfnt_off00015ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF6 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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