Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63e6202b8c09ffe…

MALICIOUS

PDF

95.8 KB Created: 2021-09-16 04:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74ec24f9c4f6ed52630ae28ca1957f2e SHA-1: 8c18b68198b303572e7b495b98221d435bc987ad SHA-256: a63e6202b8c09ffeb955f3d6edf9815fc92f56c47d47222ae96279e6baaa5edd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=root+motorola+droid+x PDF link annotation
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa2d199c1b3cd8239fc60973b00116f1/33044691193.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/given.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/xulegobemewologimas.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xivikifixufuraregi.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/84942376600.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/41300488022.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/4427932862.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/xipivolexorabibarir.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/rexarateb.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/70377623527.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210916081705.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6026c29ad---gazafefuzus.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/86264366096.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/67757494220.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/fifipuwivupimeba.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/3679290881.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/lugagedoratebu.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/81157767342.pdfIn PDF document text
    • http://flomojapan.com/upload/files/51646285742.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/72093465299.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/1375745626.pdfIn PDF document text
    • http://platcometals.com/images/file/27692676861.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/kefit.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/24852434700.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/ponadegizun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 24704 bytes
SHA-256: 5c24aea1520e6dffa6a56b407ee9ce6005ec4f929e0a3c1ca4c4905bb6de96cd
font_01_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14492 10152 bytes
SHA-256: 695d32997e3bdc6a8d80540f219c94071cea6fea469d249962535db7f2cd2c76
font_03_sfnt_off00015b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3D 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4