Malicious PDF — malware analysis report

Static analysis result for SHA-256 d57871345f18f351…

MALICIOUS

PDF

81.5 KB Created: 2021-03-04 16:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 004d4b8ef553535a8c39e9ad26abae2d SHA-1: d075ff119fcc5454beb012c655ce7eff4e9310b0 SHA-256: d57871345f18f3519c95e10ec1dad292f8ab9f74e8de1bd9d4cbed5418d923f5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('bologen.ru') flagged by heuristics as a potential link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=la+iliada+trata+de PDF link annotation
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/fc9e20c85e403c6.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/kunibasedevenofite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_603d3d60c43ae.pdfIn PDF document text
    • https://rixikevepu.weebly.com/uploads/1/3/1/4/131408169/9110913.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/5a437810ba3.pdfIn PDF document text
    • https://kibajalixil.weebly.com/uploads/1/3/0/7/130739780/tavulinisikitopaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5ff7784f37996.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/loguduvetepixelororupi.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/north_carolina_drivers_license_test_handbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girofili.myartsonline.com/82076794416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f0eb112-8bcc-4200-b1e0-c393540fac1b/who_really_runs_the_federal_reserve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924980f2-b3b3-49fd-a0d5-227e0945350e/17867915252.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/samsung_65_uhd_4k_smart_tv_nu7100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ccf71e-10d8-4de3-99da-bbe49d286f9d/merit_badge_pamphlets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badaecbf-6f58-4eca-a783-1c823cd4e7f6/air-lap1142n-a-k9_setup_guide.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/32153129899.pdfIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_d7094842a9b3471883810909c321f785.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4f2a77-3440-4379-a229-30ede3e0da27/are_boss_audio_stereos_any_good.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_c1f48d58843c49cfaad4a72236555f4e.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_4913e3f2bb444aa8a2849aa05aedd69e.pdf?index=trueIn 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
    • 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_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 4584 bytes
SHA-256: a60f9ad8ea73d01a6b92d087a9d549718b89b38bca0b8ac1ab49e70d4110c44b
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 11448 bytes
SHA-256: 1537a061148c4ac973f3ef0f512f2a4f1a24252d54dcd166fd10f4e0c7a06ce8
font_02_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 16144 bytes
SHA-256: 7c46bdd5995085f1b667db334183647021a114cb1e9de6240a6a2392c095f0cc