Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c5007bd87f2227…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 01:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c03ad3d72c0b5d1c874aefb829d89e7d SHA-1: 703d6079493979722886891cefd79ab2960760e1 SHA-256: 22c5007bd87f222735c03774baa7e918d3afe66a39bf8d5b33304ac1191b526f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is likely used to deliver a secondary payload or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://shahnawazonline.com/uploads/files/56946245945.pdf In PDF document text
    • https://ibextrail.com/editor-images/35843889716.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/12828744121.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/neneto.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/49209697388.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/xazumawojaneborijirowe.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wevagitasefu.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/40984298165.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fbea5bef0---1407031373.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/17184688187.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c5c7a5cd08678323a85b5f6842528a86/6589902847.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210914065623.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/natuwizef.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/99724461868.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/75316252179.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/lomodefevasura.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/gajafepapesefufajujunag.pdfIn PDF document text
    • http://moretonassets.net/userfiles/zirujalidatunodagamisozi.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210919051757.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/fonafepikat.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/84939759687.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/dusetaxulapolifigitamo.pdfIn PDF document text
    • http://elpijisystem.com/file/3002530763.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/jiluwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=antutu+score+list+2020PDF 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_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 18176 bytes
SHA-256: 45ea00c0d7b9c73609bcd39e349f7cf6ceec616449b022ad3c48cf9b179a0c9d
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 10384 bytes
SHA-256: 46f9cd2be254c1dd3b31573f2db65dbc76a750a774116b576b11080f17c275af