Malicious PDF — malware analysis report

Static analysis result for SHA-256 589b50dd2f2beff3…

MALICIOUS

PDF

78.7 KB Created: 2021-03-28 01:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e3b42c841b8d9ac3acfcf1428a559253 SHA-1: 3e9f6b908b01112812ba02107d5e9246535c5dd8 SHA-256: 589b50dd2f2beff306f58a55c95bcf6f8cc139ea96c13482b433178f68a23a4f
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to exploit users by directing them to potentially harmful websites, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://maypoin.ru/123?utm_term=backlinking+email+template PDF link annotation
    • http://makeyourself.xyz/does_costco_sell_resound_hearing_aidshqmk9.pdfIn PDF document text
    • http://item-get.top/what_brands_does_nike_own_2020dbdb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_602c419ddfdb0.pdfIn PDF document text
    • http://bred-enligne.com/voketotixexozeraa92ji.pdfIn PDF document text
    • http://kzrovk.xyz/what_to_write_when_a_coworker_has_a_death_in_the_familyv2inq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490366/normal_602372e325909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426699/normal_60274bd21e13d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_601bd3a610f97.pdfIn PDF document text
    • http://gnatural.space/duzawitilepokoxovopisukotulv75.pdfIn PDF document text
    • http://tavaxibewoposo.iblogger.org/5843080232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_11d90b914021429e9b5c33ab880edbdf.pdf?index=trueIn PDF document text
    • http://goguxiwobuw.epizy.com/xumaduzu.pdfIn PDF document text
    • http://fukanabe.epizy.com/42124177404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df26c7f-ed6b-47a5-823f-c07349c10fa1/sixidugetunuj.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_dbd4e98662d9429a8879dc78694e2d7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b1037b-f1bb-44c2-82a0-3160eee4b2b3/fenimegomazogaxunibividu.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/developmental_biology_gilbert_11th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d9eba0e-6bcd-43fc-9306-5e48e9d3d122/51469410773.pdfIn PDF document text
    • http://tuzoxizusuzu.epizy.com/sezexejavelipelofenam.pdfIn PDF document text
    • http://rutotonofawe.rf.gd/yesterday_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9acc951-c9a5-4f43-acc1-db0b2de102bc/supersonic_remote_code_search.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca6a87c-6539-4c70-9ced-2b1baf3ef609/how_to_repair_pvc_sprinkler_line.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/iso_limits_and_fits_data_sheet.pdfIn PDF document text
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_f2619962d7694bccac76ed2b1403cd0f.pdf?index=trueIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_ab964325c05d42c89b5b3227924acfa6.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_a93c71a4a5de4381a1b46e10518f6d1b.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_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 5092 bytes
SHA-256: f40ea86a53922445612417a535139f0b0d581b236d840f02f140a178d9baf45f
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 10412 bytes
SHA-256: 0a1f4d103128e10845b2fbedcce3ec5ab9fba5991dc67b5d0d9061c164ae3d0f