Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87b92dd6ce397ff…

MALICIOUS

PDF

79.1 KB Created: 2021-09-14 06:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53a8ebb5523dd00bceb39f14f871b670 SHA-1: 9efd7296b8ba3e01d261685e6049473dd751cf1c SHA-256: a87b92dd6ce397ff6e464189479b4925f1afd0cb7a73d03483f4c16bdda51802
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely exploiting the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=address+bar+chrome+android PDF link annotation
    • https://groupunsur2.com/contents/files/56369230006.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///83663829331.pdfIn PDF document text
    • https://tavio.ru/files/file/babexa.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bupar.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/90573540943.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/mapeliji.pdfIn PDF document text
    • https://estoniapools.com/contents/files/toveboful.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc6feb06b---8136156069.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/12243404884.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/65726359002.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/63214178742.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/vezumuroporejabevanurud.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/36987258337.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/rinatebikode.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/timesukutizawog.pdfIn PDF document text
    • https://hoavily.com/uploads/files/82964025671.pdfIn PDF document text
    • http://chromavials.com/d/files/fudorupogetutovuvoju.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/42777856780.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/21847651950.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/xalemip.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/somopepuvibasunirife.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/likiginaludivuwekeduxem.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/40351159399.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/24097787073.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_off0000d0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 10612 bytes
SHA-256: d0601642007caf1d548028e0253e8efd35277e835cca666fa989dcda55638b41
font_01_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 17872 bytes
SHA-256: 90b07f7062eb02cf6bcef1bf2eb804cf6c8ff85c3b23e991d38cee07b0476f84
font_02_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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