Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ce17852b9239e5…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 06:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa98c23172181d3ad05461547dc94b69 SHA-1: 55a2ec40670cf91614be2b58896f4ec7bcb47f39 SHA-256: f9ce17852b9239e50afdbe60a06b4a0193b515dac1c93de2bc403c30debdd6ae
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only design with a clickable action, typical for directing users to external URLs. The presence of numerous external URIs hosted on disposable domains further supports a malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=last+friday+full+movie+free PDF link annotation
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210907183821.pdfIn PDF document text
    • http://hkacca.com/userfiles/tunulemebo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614886fabea76---xuvurim.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/19051115811.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/xawajaru.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6f846593b---rabonomu.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/rupowexofijubifutagizapap.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vegodivelagesijinufajemat.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/junameferonezovigodemila.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210924003944.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210907205459.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/79452672966.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210910191126.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/pujolelelativokiramibus.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/kujeviniwogereparuniturul.pdfIn PDF document text
    • https://digireg.dk/upload/75669785538.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/75786747481.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/rududefedodumave.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/10757151729.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/67366576631.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109130355213294.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/mosojesavezos.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/25488225294.pdfIn PDF document text
    • http://it-hair.com/userfiles/vajinixudagogeselokup.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vurufetivukumefavira.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_off0000b359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB359 14524 bytes
SHA-256: 32ccf5641a55f85995102eda89f54944df3d613187e85a91e4d6707609602892
font_01_sfnt_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 10648 bytes
SHA-256: 76b4ddcfdacc70f7833c3f7516d733245fd695bf492959e8fde8aa5c3801d052