Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ef9a132fdcdb21…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 00:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 775fb4e794a49a06f35fa5bb99087668 SHA-1: 305af4334b80cb307bc067316e18afcec08f8219 SHA-256: 98ef9a132fdcdb211e1ee4977450950e05e14e2ed6b0db96b34209ced7286f43
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or initiate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=idle+mafia+tycoon+manager PDF link annotation
    • http://oticonshop.net/ckfinder/userfiles/files/memusulowepaputafafovefig.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/170507038632.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145048308e6f---44311223394.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/67686264954.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/73937643099.pdfIn PDF document text
    • https://razredna-nastava.net/files/19635953233.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/5417885573.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/15410527643.pdfIn PDF document text
    • http://erimti.com/userfiles/file/88615390710.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/weralogatajapemapeb.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/17637279099.pdfIn PDF document text
    • http://telecycling.info/files/file/puvobero.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/duwotubekaxigosa.pdfIn PDF document text
    • http://vejwun.cz/images/42051496250.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/59908639010.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/nowogifarezediperalerog.pdfIn PDF document text
    • http://mextro.de/upload/files/fajinowogufuxuxuwopomame.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/69360561463.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/84170289863.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/3551486769.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/dapojusisug.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_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 18204 bytes
SHA-256: 73186e2798597bc74a27a02ff3ebd3dc4f3b1c12c28c77ce6b6fa9b7df823733
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 10716 bytes
SHA-256: b8d4a4a8b5fe99375ab4e30fe580522d59585d744178f237830323366193541e

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