Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada5fdd2c06e19eb…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 22:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 018a2a7093f7306b38b5695476774a6e SHA-1: 338e158d2c71b79caa1f2f698a2299650243a348 SHA-256: ada5fdd2c06e19eb1223de8464dde493dc4d0a7d811e97ef15c993ca901904c0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, flagged by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to one of the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • 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://asfalon.com/__files/file/57625024659.pdf In PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b161cbb4---81586338129.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/jazemefoke.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/5874103770.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904125908582.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/lamegizenipezobajijafu.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/38574688534.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/mivositiwal.pdfIn PDF document text
    • https://vleek.com/uploads/files/51411564977.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/dusewem.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/revofolagugebinerumif.pdfIn PDF document text
    • https://remini.hu/userfiles/file/3222857501.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/83060493687.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/79576685565.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/pukuwuxuge.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/xixovaka.pdfIn PDF document text
    • https://architektor.ru/uploads/file/83811498429.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344b2205d91---21701303220.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210904141057.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/gubovulelolijalafuxupo.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/rebefunej.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/7050413133.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/gopafekilewale.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/56322350598.pdfIn PDF document text
    • http://centronegozi.com/public/78725185285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=find+the+radian+measurePDF 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_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 18196 bytes
SHA-256: 0fffb5020e4d19842fbd73177d94855e3326c51c91acd2cba9df80b8a462e7fd
font_01_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11360 10424 bytes
SHA-256: b34190b88776e06e0d4ffebe39f4f9674dcdcdaf63740c69320ac53171136208