Malicious PDF — malware analysis report

Static analysis result for SHA-256 548e1da98db90a59…

MALICIOUS

PDF

85.6 KB Created: 2021-05-06 03:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4c1ff2cb7ddabfd1a97f4c7ac56c152f SHA-1: 5a14680a1fb2020575c620f1c93984e99cef00d8 SHA-256: 548e1da98db90a592009686e709c092c9089df62c487d43e302d5848d8bda15f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to direct users to potentially malicious content. The presence of a critical ClamAV detection and ML classifier flagging strongly suggests malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a T1566.001 (Spearphishing Attachment) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=what+does+glock+trigger+housing+pin+do PDF link annotation
    • http://wisitens.online/765915438816d4b5.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/lepedafiterawikonu.pdfIn PDF document text
    • http://rkconstructionsucks.com/fogitebutekijfz2b9.pdfIn PDF document text
    • https://xolasugoduto.weebly.com/uploads/1/3/4/5/134592704/gomonawuxawizosame.pdfIn PDF document text
    • http://italia-doc.fun/wotinipawirexufijuwifsp5b.pdfIn PDF document text
    • http://1cats.space/pogusubefuvevlkm4s.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/dulunafudap.pdfIn PDF document text
    • http://carinsusa.info/hansel_and_gretel_get_baked_cast9xn2j.pdfIn PDF document text
    • http://rentline.pro/24278504800nojvp.pdfIn PDF document text
    • https://solazipakiku.weebly.com/uploads/1/3/4/5/134509697/gagowopirumexufiler.pdfIn PDF document text
    • http://nasporte1.fun/why_is_my_hp_envy_5000_printing_blank_pagesjao8x.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/mufugitupip-bamijebejenu-nitabamupud-borux.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/4b850462-7924-4513-ab52-ff5b8b93847f/craftsman_6hp_30_gallon_air_compressor_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b8eb71-28ec-4992-a32a-25fa54c0abd2/32008685850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cea3cad-2f72-4b59-be92-89b6aba70fe3/84685467115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa12d86-dde5-4d54-815c-d8d809d034b8/is_deep_freeze_compatible_with_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0959feea-47bd-477f-a82e-7800987c3857/axis_label_plot_mathematica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb5436a-0c1f-4c81-ab4f-ccb5be0f4089/excel_2013_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37f2421-12fd-4e31-81d8-f0efae174a94/70368666616.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_off00010d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D77 5412 bytes
SHA-256: 6f9a6c5b9289dd4b6ad584a13ff4247e363e532bca6477a0c49a8fbe72983cea
font_01_sfnt_off00011fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEA 11984 bytes
SHA-256: 89164d868ec4bd6bff53a6fe552594ad2baedc794e98c93b5bbdc9e249c9df6d