Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50006c2cfc5b586…

MALICIOUS

PDF

71.1 KB Created: 2021-02-15 10:06:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3278d97dea8f93c12b1559398477d72a SHA-1: 40fe833bfefd0e2ba2404d3321a8b205c8ad663c SHA-256: a50006c2cfc5b586dd5f339eee77accb90fedad1e430f8d8ace9de219674c14f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary IOCs are the numerous URLs embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8627

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://jacksth.ru/strik?utm_term=carnival+cruise+deals+last+minute PDF link annotation
    • http://lotto-investclub.com/cccam_2._0._11_ipk26nwz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5fc8958a189a5.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/hiigjij/19470958777.pdfIn PDF document text
    • http://digtalcaliper09.xyz/fujakuzokajunutupinx073.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/jhihiaS/54152940468.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/k6XTgfO/diaphoretic_shock_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/xudevekelefe/ficbgdH/79335212135.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/hbPhcLy/rexall_london_ontario.pdfIn PDF document text
    • https://cdn.sqhk.co/kitobanifamo/jigEtjj/air_traffic_control_assistant_jobs_uk.pdfIn PDF document text
    • https://finibolamojirum.weebly.com/uploads/1/3/5/3/135341575/nilobega.pdfIn PDF document text
    • http://taxurofetizi.22web.org/dukakuvuxozotigajewujared.pdfIn PDF document text
    • http://ourfutures.space/mona_lisas_and_mad_hatters_sheet_musiccc6sd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koxowideza.epizy.com/sadesovezonipisop.pdfIn PDF document text
    • http://gepuxaxevo.rf.gd/brightest_led_flashlight_for_android_app.pdfIn PDF document text
    • http://tadukaxuzevida.epizy.com/l_attrape_coeur_gratuit.pdfIn 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_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 5048 bytes
SHA-256: 60e8260b7bf9727c98ab7c1a4bedb2d598c8738af5c3bd9887ad49061148232f
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 11156 bytes
SHA-256: 247a3022b9e6989c27a458dc529ac6a8464daac10021078d25e0e47d6cd0a4b8