Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae3e2ecc39ab71b…

MALICIOUS

PDF

81.1 KB Created: 2021-03-16 16:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 384623c9dd418f51c62607ddd3dea0fd SHA-1: a23d576b012e4e1bf4a3311e072b65ace6f3a0f9 SHA-256: 9ae3e2ecc39ab71b90172fd29ec4fdddc3fe5dc8812028b765118b6fc80f5767
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'bst dongle exe' in the document body, combined with the URLs, implies a lure for downloading potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=bst+dongle+exe PDF link annotation
    • http://artrosil.xyz/58118720043bpd91.pdfIn PDF document text
    • https://dugumali.weebly.com/uploads/1/3/1/4/131437411/8145699.pdfIn PDF document text
    • https://cdn.sqhk.co/goropakuvoge/3FD5heK/dj_bass_booster_and_equalizer_pro_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/icmgdif/dikigav.pdfIn PDF document text
    • http://rmk4sale.xyz/tugikopejuloe1uh9.pdfIn PDF document text
    • http://osummer.space/xibitelowegiwimozixujoripjbxd.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/kuxozurizojim.pdfIn PDF document text
    • http://situbune.iblogger.org/bumble_date_apk.pdfIn PDF document text
    • http://disconto50.pro/natuladosumedojisue50d.pdfIn PDF document text
    • https://supuzuvafexag.weebly.com/uploads/1/3/5/3/135383103/9010734.pdfIn PDF document text
    • http://leopolds.space/teoria_marxista_del_valor8g4b2.pdfIn PDF document text
    • http://electriccannoz.club/1342423865285ur0.pdfIn PDF document text
    • http://opensol.xyz/49457703415gfw2w.pdfIn PDF document text
    • http://natasisenexu.22web.org/ach_authorization_form_template_word.pdfIn PDF document text
    • http://fitokaps.xyz/843584025268tgdg.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/djguieS/kofikupekinu.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/ab709a3f-eaff-470f-9d21-fa58aa45f9e3/pujavesu.pdfIn PDF document text
    • http://wuwovedivaz.rf.gd/mri_anatomy_of_abdomen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129f40a9-6c08-433c-a43a-fe4f6e2dd9dd/48716087690.pdfIn PDF document text
    • http://fazadag.rf.gd/putegizitujuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/919ddf3a-018e-416e-b3d1-995b98a50bd7/pelupiwugosuxilu.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_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 4804 bytes
SHA-256: 8b737c1afe83f3db939f9af2331bc2e5c208f5e712b00e5c0b40a834815bb431
font_01_sfnt_off00010832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10832 16876 bytes
SHA-256: 0858f855f6c348ceab56cef0e503f0b3fe5e1e320765549ab328d47b9d17f21f

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