Malicious PDF — malware analysis report

Static analysis result for SHA-256 d799b4c302a3c346…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 05:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af7a534e320ed1f068e19c9476acac65 SHA-1: 65f97cdd72a16f58f7ce53952bc4a55c27c0728e SHA-256: d799b4c302a3c346d9decd7baa145777490767b5c26654e962b966ccf0a1d437
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links, many of which point to disposable domains or are algorithmically generated, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed for malicious purposes. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://needychild.org/ckfinder/userfiles/files/gakefidekejusisomomipawi.pdf In PDF document text
    • http://studiodabo.eu/userfiles/files/xitirazotedaj.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/zogibabuvuseme.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/nokenigepikiboputenugurot.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/bujejilipomedu.pdfIn PDF document text
    • http://landpas.pl/upload/file/69816091367.pdfIn PDF document text
    • http://biomehl.com/images/content/files/25809908687.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/xujobatef.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/76890051780.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8daf836fa---miwovapuzozaxow.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/75333753423.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/58971536616.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/rekuporuwutilaweg.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/garirarenibuwarega.pdfIn PDF document text
    • https://aashianarealty.com/file/surewimowoxogepovujutid.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/fapagosinunegeparogivut.pdfIn PDF document text
    • https://ewt.cz/res/file/98844931857.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/23608252385.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/tufiga.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/63167969361.pdfIn PDF document text
    • https://www.amata.org.uk/ckfinder/userfiles/files/kalaluxulanan.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4qa3ba4cjuh6kh0ph5ic07oveg/dowefivosinodejidajezot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+background+service+alarmmanager+examplePDF 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_off0000b0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AC 15776 bytes
SHA-256: da5a14b7542817a17cbfb283e164ded462013e57879130dd23aa58d0923f61b6
font_01_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 11240 bytes
SHA-256: 27dbfc866c90430941f65a731d8034598e38f66ba35e745eb4cb1a98f21da3bf