Malicious PDF — malware analysis report

Static analysis result for SHA-256 633b6506ac16571a…

MALICIOUS

PDF

82.1 KB Created: 2021-10-14 15:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60590c3c678c1d7e6335e4768434661a SHA-1: e84fcf277bcccda1bab0d181cd624f0775ac2edc SHA-256: 633b6506ac16571afc8ff5588ae2a77939e394b1b5f985b00e409975ff03cb7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://unixsensor.com/uploads/files/202109250000355179.pdf In PDF document text
    • http://visit-pune.com/userfiles/file/22515554032.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/6720962789.pdfIn PDF document text
    • https://inks.bg/userfiles/file/85719532739.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/nijutemawobazimutiseg.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/zasepiwaravixisaditodo.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/40279596215.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/kopamanunijonedapusofovam.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/52921582797.pdfIn PDF document text
    • http://craj-ops.craj.cz/soubory/3201966718.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/biwudugeriregade.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/22528722370.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/ruwitamopoxusa.pdfIn PDF document text
    • https://hinaweb.com/upload/file/xuxofovujeb.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/66431115655.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/juzijupefidibedeginu.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109100314437210.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb9d7d8e3---sagub.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/pezozutum.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/vekekepajuwasulomazekadim.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/86343220217.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/mufezojifovibapowo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161561d9795346---mukenedadewulusosap.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wuliv.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/61521849651.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/juwusozufofegaket.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=how+to+get+free+coins+on+brawlhallaPDF 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_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 10832 bytes
SHA-256: 7c8d0a0787b7ab4a68bb51b2ed1253a7ce33b27920bac64d568c5dff3259939b
font_02_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 17612 bytes
SHA-256: 5a9f8b9ed9a3748899751ef47ffb723668167e4002060223bfe4c7198f6630f6

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