Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8abcd4f88fafe5…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 23:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 367f9420369d8bb318e578adb23a5a90 SHA-1: 8793da066b251f058e41da79bcf239162ad9b267 SHA-256: fa8abcd4f88fafe5485cf474eda3ba352177508fcc768ae456630c5494f6256b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is likely used to distribute links to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cochemical.com/upload/files/luzisawirox.pdf In PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/62769648984.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434be6a23a1---kemadobatovesawubetal.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/mujigipepaludumapudolu.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/59879911921.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/69211488959.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lepotokuzizenimilexow.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/42028662502.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/3078120747.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/nolijavijamikufekidovir.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/26444635907.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/88998270581.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/wikebefidovebijodufi.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/mipexepod.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/xomosazopokoro.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/wazawudofufi.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/sumowefukopavesanumowowex.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/49112919903.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/wijefibup.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148eb723749d---fadud.pdfIn PDF document text
    • http://drironcat.com/images/file/99775655058.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/ligekirolajezememez.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/69598906787.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/gojumovoxasenanukekatep.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/30824257877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+clear+history+on+my+tabletPDF 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_off0000cc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC18 10828 bytes
SHA-256: deae5c1e7c668af8860d9b919c53d2cd211ed8f358607f40b108777b698c6b0a
font_01_sfnt_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 17444 bytes
SHA-256: e7ec43d7414e25b4f13ce4d189a719e61e40213390148274a08b8bd3eabd9035