Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71e183a286303cc…

MALICIOUS

PDF

88.4 KB Created: 2021-03-27 18:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 399a1d0fb4f4dbb8522d0feb76f5ada9 SHA-1: d03ca33b1a7c6f3eb77da645b5ab3906afa12d09 SHA-256: e71e183a286303cc8a7ef9ef37d231e9e48c9e4eabd894be4935d3680a135c37
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'bologen.ru', suggests the document is designed to redirect users to potentially harmful websites. The PDF structure and embedded links are indicative of a phishing or malware distribution scheme, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=discovering+the+humanities+4th+edition+pdf+free PDF link annotation
    • https://paguzijap.weebly.com/uploads/1/3/1/4/131453408/7095b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_6055f73bbe454.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/what_is_the_salary_of_cabin_crew_in_indigo_airlines.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/vubufalegokivibi.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/free_isa_arborist_certification_study_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_5fd7e9e6d5d9b.pdfIn PDF document text
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/13cbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451369/normal_5fe8d5f139432.pdfIn PDF document text
    • https://senokolar.weebly.com/uploads/1/3/4/6/134628648/rasowuwuvixeduluse.pdfIn PDF document text
    • http://toxedajenoxin.66ghz.com/56374895067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_602e6b918cdab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487625/normal_5fe286d756aab.pdfIn PDF document text
    • https://munowimil.weebly.com/uploads/1/3/1/4/131406650/venoz-vujeluridomofow-xetema-fajopas.pdfIn PDF document text
    • https://mutuvedaluvop.weebly.com/uploads/1/3/1/8/131856278/c0d7aa88e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujakogi.onlinewebshop.net/33993874499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c7f3dd-9bc9-4a67-bed1-a239236eada3/dyson_dc35_floor_brush_not_spinning.pdfIn PDF document text
    • http://wonodemugub.rf.gd/27777971671.pdfIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_44bfe7bc9d344322bed0d8a6fc4c4833.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_afea585136ab427a98bf20791c820fd3.pdf?index=trueIn PDF document text
    • http://niwurekatexo.atwebpages.com/cancer_statistics_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543b37a3-db1a-40b6-b808-d9646ec922e1/71345048173.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_737a81881a124dd88265e6dd055416cd.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_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 5684 bytes
SHA-256: 7c0315cbb1670851be557f077cb14584f6025a023680fdd6893cf5357813271b
font_01_sfnt_off0001155d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155D 12540 bytes
SHA-256: f52009b1e4a7015b86b324d6923ac8527609f2634a16bdf07fc30964376b17d7
font_02_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 16084 bytes
SHA-256: 3dd6252bb62cdcc21e2b76bdeb68ba6c8db9c2d08edae94764e010183c5b1848