Malicious PDF — malware analysis report

Static analysis result for SHA-256 a737847d23baba4e…

MALICIOUS

PDF

65.5 KB Created: 2021-04-04 16:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4fb27382ecf2ce30e60df83a01c93f13 SHA-1: 9044a0baaf828dd6de306accd20ff6e3ac794fde SHA-256: a737847d23baba4e35b8df2d27328149a7b6814071f201762a259f083a76df96
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to product manuals or software downloads, consistent with phishing or scamming attempts. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect the user to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=dyson+dc59+motorhead+manual In PDF document text
    • http://gutufozif.iblogger.org/google_chrome_mac_os_x_10._9.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/iaJfygf/vowojiv.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/jgcjhif/gunukajuzomaginu.pdfIn PDF document text
    • https://cdn.sqhk.co/wikepijosipi/ib4hgKc/lesson_plan_all_about_me_activities_for_toddlers.pdfIn PDF document text
    • https://cdn.sqhk.co/kunutewiwit/i3hfih8/ripeditegitixizexukusigen.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494877/normal_5fecad804d0b6.pdfIn PDF document text
    • https://cdn.sqhk.co/wotudasigeb/NlRjjgh/60821648606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_5fd14e13d5176.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b07adc-5832-4732-9bab-8c618d27e10a/gupexabavawopedobotanonu.pdfIn PDF document text
    • http://baxogezupeg.rf.gd/soxozogetepopoto.pdfIn PDF document text
    • http://tavokitewigi.rf.gd/44906235433.pdfIn PDF document text
    • http://gidozowelixije.rf.gd/motorola_pr400_charger_flashing_yellow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04820d71-0bf3-4af6-b919-51d98fe67200/can_you_get_a_scholarship_for_dance_team.pdfIn PDF document text
    • http://pixuxurarosu.epizy.com/vinusun.pdfIn PDF document text
    • http://tumejatamivalu.rf.gd/ap_grama_sachivalayam_results_2020_download.pdfIn PDF document text
    • http://wosekamilos.epizy.com/affairs_cloud_current_affairs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 5560 bytes
SHA-256: 04becbaa7c31d0ae846a13034ec81696b1f0b95ef8def2593c066a7d4b85d606
font_01_sfnt_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 10008 bytes
SHA-256: 7926a6a2067c7bc6596a3ba3fa5e9ae2a08dce812cbcc849439c14f547343cbd

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