Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed325d2ba10d4d43…

MALICIOUS

PDF

74.1 KB Created: 2021-02-23 02:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 845bf027b0d0f63502cf2d1e45a637cc SHA-1: 7b47c8e273a05f77ee2e1006726839f372a54773 SHA-256: ed325d2ba10d4d4319357383030329d6ce09644e77cb56684d58cb7b8a879843
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=singapore+math+curriculum+kindergarten PDF link annotation
    • http://jakitebalever.iblogger.org/futivamiweburisipomo.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/rezujoxot-ganipo-komuregetop.pdfIn PDF document text
    • https://livesagu.weebly.com/uploads/1/3/1/4/131437401/rakijimikevubuwuvax.pdfIn PDF document text
    • https://dazenesulamese.weebly.com/uploads/1/3/1/1/131164173/lipifubal.pdfIn PDF document text
    • https://bivolureru.weebly.com/uploads/1/3/4/5/134583024/8783236.pdfIn PDF document text
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/zojaladetotuzunu.pdfIn PDF document text
    • http://vvd.bar/download_print_driver_for_hp_officejt6tye.pdfIn PDF document text
    • http://dovulup.iblogger.org/53592233222.pdfIn PDF document text
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/1553490.pdfIn PDF document text
    • https://fevuvewuvadudu.weebly.com/uploads/1/3/4/6/134650824/6059b02cd0b7b.pdfIn PDF document text
    • http://gelchlen.fun/laxufadokiarou3.pdfIn PDF document text
    • http://vifaborabab.22web.org/69514948562.pdfIn PDF document text
    • https://manabuvajej.weebly.com/uploads/1/3/4/8/134847277/9761284.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvebuxuloruvux.epizy.com/rigefukobidoz.pdfIn PDF document text
    • http://tupaputukexoro.epizy.com/bns_songs_album_free.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_off0000e441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE441 5476 bytes
SHA-256: dea628109895ed2cef25436c7006c4bed3b13a0bd03b6a4e3c62e39d9e9daa12
font_01_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 10880 bytes
SHA-256: 18165d33f7649e31cccc6c66d4a7bb6b3502eac22c6142602280cc8167c1c5c0

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