Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46106bb7fd7764f…

MALICIOUS

PDF

80.2 KB Created: 2021-05-12 13:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 88c57d22c5347a48df8872408bf6b586 SHA-1: 271c264aee85fc83ed1c28aef08e70214929e67e SHA-256: b46106bb7fd7764f10e79bd7fe704fefba827b34f5508578f022900fddbb6779
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. The embedded URL points to a site that appears to be part of a phishing campaign, disguised with a seemingly innocuous topic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=how+to+set+up+a+portable+air+conditioning+units PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475737/normal_60562b09b6e8a.pdfIn PDF document text
    • http://difozoxezepi.getenjoyment.net/98371548979.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/what_is_health_psychology_course.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/wegagajedunab-jofini.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476288/normal_5fefeeb0b076d.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/bistable_multivibrator_datasheet.pdfIn PDF document text
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/rajiwali.pdfIn PDF document text
    • https://xagatozemeladab.weebly.com/uploads/1/3/1/4/131406701/fasoropatelefo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486765/normal_6008de6b8d067.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcbb14100328.pdfIn PDF document text
    • https://senamevab.weebly.com/uploads/1/3/4/6/134689233/nagoxipewafon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5fdf7ca0962a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jigezilor/js_bitwise_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028106c0-6d14-4e3d-a49e-0e61bc6994ba/is_the_maiden_voyage_multiplayer.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_6623d02cf5e549ecb30b7e3fae287ed9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ca4dff-fdee-414b-b7c3-0271a58809e8/add_2nd_edition_ravenloft.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/cpp_industrial_engineering_curriculum_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77080838-8f42-472e-b485-ab4718620bfa/ladanawapirijep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04780439-a510-4f9d-be15-0cddb7a919d1/diweredowafud.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_c39857365a714bcdb400fedefd4e37de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavalukato/89334526405.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/bed_sheets_and_comforter_set_queen.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/13291260970.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_67611403f216483f898a2e2f59a5545a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBF 5436 bytes
SHA-256: 7c36392834aa0fc6d7232f3ea5feaa262786cb49472279a09309a0004c888e82
font_01_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 10852 bytes
SHA-256: d77017e0a73e03223daa062f0c2049789a2349532833f1e8f5dfcbab8481d5a4