Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e53a967ed285dc4…

MALICIOUS

PDF

73.2 KB Created: 2021-04-25 18:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 774d3d25e16b6e4559039d1401545d6c SHA-1: 8282c75b46ceb033d16d73da4b235a83349ce795 SHA-256: 4e53a967ed285dc45a0d249b045358ed79c0a01dc539465bd71b7690200b082c
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, with one prominent URL being vilenefex.ru, which is likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body, though heavily obfuscated, appears to be a lure related to a search query, suggesting a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://vilenefex.ru/strik?utm_term=panasonic+plasma+tv+standby+mode PDF link annotation
    • http://fallofelin.online/weduwijalififawunajef1nc7h.pdfIn PDF document text
    • http://erogancolumbia.site/36948810664fguh7.pdfIn PDF document text
    • http://daliadiago.com/81997435362jicqx.pdfIn PDF document text
    • https://bodizolisasutez.weebly.com/uploads/1/3/1/8/131871954/5565186.pdfIn PDF document text
    • http://labozozirakeko.22web.org/98622510306.pdfIn PDF document text
    • https://kolekidir.weebly.com/uploads/1/3/4/4/134441437/bamagowoxifikide.pdfIn PDF document text
    • http://usacreditmonitoring.info/84066671693lkm1.pdfIn PDF document text
    • http://mirror-x.org/divorce_in_the_old_testamentnszph.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/agriculture_diploma_download.pdfIn PDF document text
    • http://pajuwepubawip.sportsontheweb.net/wedoxivalamafele.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/how_to_cook_kirkland_glazed_ham.pdfIn PDF document text
    • http://jifazuniduvosi.epizy.com/dejizurelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25fca776-f6f9-4f28-99f6-285449a75287/82103542247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c593f3d-a5a2-4743-b671-a317ec166bcc/36593523563.pdfIn PDF document text
    • http://pakafadudu.epizy.com/39779515166.pdfIn PDF document text
    • http://wiloradakuno.onlinewebshop.net/vumiwerorojiwapixivud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063e3c47-f669-44c6-b813-7dfc39316513/99364598977.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/83196379474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839f3b2f-4cc8-407f-9fb8-7e058a3c6db8/wuwukozutunos.pdfIn PDF document text
    • http://kesobiw.rf.gd/mustache_template_file.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/plane_ticket_template_photoshop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/451cc8bd-1214-45a5-9996-6bd59ee832f4/first_aid_book_in_hindi_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/batman_the_dark_knight_rises_android_mod.pdfIn PDF document text
    • http://vavuliremu.rf.gd/casio_f91w_strap_size.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 5428 bytes
SHA-256: 6f2d046f6519e50ba6d1502d8a46487ace24ad5b6c414e5ebddbf471ef13e61d
font_02_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10452 bytes
SHA-256: d4d2fcef7ae74fd5474fe3cc031c173a77f041ceb8d14ad0abb7bdee2c973e90