Malicious PDF — malware analysis report

Static analysis result for SHA-256 4779c967f6917315…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 19:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5c96616fc01b1c39a7cb7d7abc94db86 SHA-1: 6b6d91186f14cae282fc5baa00d392001a25f30f SHA-256: 4779c967f6917315c9c8d8e482b8558e99e7f6c5b85c0ef7d187da81c3475a55
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The PDF SEO Disposable Link Farm heuristic indicates a high likelihood of this document being used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://oniceh.ru/uplcv?utm_term=2018+civic+si+user+manual PDF link annotation
    • http://riviera.az/userfiles/file/53074421618.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/watot.pdfIn PDF document text
    • https://biocoils.com/img/file/7613809804.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/53525652261.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/19215929564.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/mobofufafatomaxuje.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/jiwewixubuno.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/93104266008.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/28435517840.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/noxiwutolenasedagupomud.pdfIn PDF document text
    • https://heyratacademy.ir/file/fakelugatusagidenariwuv.pdfIn PDF document text
    • http://leguido.net/files/fukuzaxogekasejixebepi.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/zatopesinakixuvuraliz.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/84422173845.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/64523312332.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/guvunud.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/mufuminefedukomifuvepar.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/vamivoditozuzabab.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/60062597287.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/degeliwumakufenu.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/71467733717.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132c14f9f3a6---juminosewolejobif.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/2c7f4798ba659582adc264426a45b52c/mamalitopuwapulepufodoke.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/punadevutigifezuzefise.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/94031758746.pdfIn PDF document text
    • 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_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 10744 bytes
SHA-256: cec2ecbe41a105571769e38d7d54996f5bc0143def85d3927f43707df70d46f0
font_02_sfnt_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 18312 bytes
SHA-256: f47c11e23b2b71bd6b725eb0ae9f1b7c90b3d0a954a61b75f112f61fda1b1819