Malicious PDF — malware analysis report

Static analysis result for SHA-256 3167ba4c768e198a…

MALICIOUS

PDF

73.7 KB Created: 2021-09-10 18:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d1a4b0b96e810564be69692dae3cc161 SHA-1: a7eb37c059d38779e4b1ecedc68a723d6fcae128 SHA-256: 3167ba4c768e198a09e7258be68cdfb5a6b7d06afcb24d5ae36fc81ffac57401
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of disposable hosting for link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://rsentco.com/upload/file/jutagijopotiwubujodadevi.pdf In PDF document text
    • http://phonphangschool.com/upload/files/81822566841.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vabazatomot.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/21995681677.pdfIn PDF document text
    • http://sdes.in/uploads/94201746807.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/21632569808.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/13560440448.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/wapub.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/21307229477.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/58932751156.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/gerefanutepuxawure.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/3257865258.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-1/20210901132749719463.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/10033492318.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/74526980639.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/48151758737.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/fikamanoxe.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/32953083197.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/61960530211.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091004451673499.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/82482061474.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/56920068749.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/50639296504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=map+android+studioPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFF 10300 bytes
SHA-256: b1e0509620569ef5cd295d1d88180da7d291037dd88bf392fb43286be12a127b
font_01_sfnt_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 17344 bytes
SHA-256: 17b2d258d3aca94d6d3729c288d4daf3b1a4a710d176daa1fa1f059a5c67b20f

Open this report in the interactive analyzer, or submit your own file for analysis.