Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac2dab501134a76…

MALICIOUS

PDF

92.4 KB Created: 2021-03-25 16:56:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b21e404b705e99e3914d8307f3453bc9 SHA-1: 2b532abf0a0b6514ac8c8a08d23a995b2772715f SHA-256: 8ac2dab501134a76439f9709b9d2089d4d74479ac43704c1774ce1be6626b166
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 hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a lure related to 'the crown season 5 cast list' and references the authoring tool 'wkhtmltopdf', indicating an attempt to disguise malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely for distributing further malware or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=the+crown+season+5+cast+list PDF link annotation
    • https://cdn.sqhk.co/zumedizojas/jiiuhgu/ultra_hd_4k_resolution_space_wallpaper_4k.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/pseudo_affinity_chromatography.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/jcJhcjd/88958106210.pdfIn PDF document text
    • https://tefafovok.weebly.com/uploads/1/3/4/5/134588422/4dbf06d2f.pdfIn PDF document text
    • https://fitikuwez.weebly.com/uploads/1/3/2/6/132681307/fuvasikuvaz_vopotej_xitesit_dikawek.pdfIn PDF document text
    • https://dojepojejexun.weebly.com/uploads/1/3/4/6/134668276/7172483.pdfIn PDF document text
    • http://javefuxola.getenjoyment.net/visuvifupupe.pdfIn PDF document text
    • http://wugumonisukanib.sportsontheweb.net/how_do_you_find_the_interior_angles_of_a_polygon.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/EgioWAc/hidden_agenda_pure_romance.pdfIn PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/0dd757a255.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/58475200842.pdfIn PDF document text
    • https://vifatogiso.weebly.com/uploads/1/3/4/3/134316440/1435352.pdfIn PDF document text
    • http://vitetiw.getenjoyment.net/aerodynamics_jd_anderson.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/cidygah/hallelujah_junction_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/gabironero/ajfhcak/kuduzoweketajixi.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/how_to_write_a_short_film_script_example.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xidozine.rf.gd/18530585169.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_9d3c6a06c77541d29d274bfa163f257f.pdf?index=trueIn PDF document text
    • http://powagamojij.onlinewebshop.net/zejuvikigezusaj.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_af50d9ea2cf14eb9b4611c15c0efa0f9.pdf?index=trueIn PDF document text
    • http://garurake.rf.gd/52703667330.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/1898364840.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_24a39d18aa694ffd839e2744b9add86b.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_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 5052 bytes
SHA-256: a49183823ccd9ab10067b4fb801d75578b8b2058d099c1b7443fa0757962f152
font_01_sfnt_off000138a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A3 13352 bytes
SHA-256: 1cde84036b683fd9eed7906e1a61fea6793068a6f2a3344fd5cdba39aff1a24f