Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18ec6671d2accc7…

MALICIOUS

PDF

67.6 KB Created: 2021-02-21 20:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9a0c0ab8c116907da69f85881a0290c2 SHA-1: f49dfd6732ecd2c015a1ac8175618ec3a2bcb8d9 SHA-256: f18ec6671d2accc775cbfe70e37eda5856b36a9cd8bdd8520a5cf3bae365aed2
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. This is supported by heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The presence of multiple external URIs and the ML classifier flagging it as malicious suggest a phishing or malware distribution attempt. No scripts were extracted, but the structure implies a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8149

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 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
  • 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://baarspo.ru/aws?utm_term=improvisation+for+the+theater+pdf PDF link annotation
    • http://pollsexpert.com/ps4_racing_games_that_use_steering_wheeli2c0l.pdfIn PDF document text
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/9212519.pdfIn PDF document text
    • http://meetsucre.pro/lavabutagawofipbq38.pdfIn PDF document text
    • http://goodsun.fun/jifugegilinilassoo3v.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/togat_sosusowexego_rebezasijibisuw_salevisaxemuto.pdfIn PDF document text
    • https://daxivikulogator.weebly.com/uploads/1/3/4/3/134308382/134912.pdfIn PDF document text
    • https://fabebebu.weebly.com/uploads/1/3/2/7/132740756/d7d0fd10ce7.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/difuzoje.pdfIn PDF document text
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/bifinibixapotezadu.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/ckuhchb/elevate_brain_training_app_free_download.pdfIn PDF document text
    • https://tezenilul.weebly.com/uploads/1/3/6/0/136085996/d0ceb0dbf34762b.pdfIn PDF document text
    • https://cdn.sqhk.co/rudixika/idjeicV/80610897082.pdfIn PDF document text
    • https://kiziwovoxapi.weebly.com/uploads/1/3/4/6/134617524/gapowelugata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 5032 bytes
SHA-256: 11f13fb935bcd49d80461d5f9470e4b13628b972dba8b180729c7ea71ff3974a