Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0863307b409fec…

MALICIOUS

PDF

77.8 KB Created: 2021-09-24 01:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a733d981e2299ecca784f7cf833b2d2a SHA-1: 2ab842e8af2d646db790d17a992bd22fb384b259 SHA-256: 2d0863307b409fecc9260f1946223bb2ab3f8896b4587440f1186badc6ee1bf3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDFs hosted on various domains, suggesting a link farm designed to distribute further malicious content. The presence of external URIs and a link farm on disposable hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://oferta.lt/i/File/salow.pdf In PDF document text
    • http://dhf-china.com/d/files/10330833215.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d2e726b97ca94837eadd95932868d6b1/xelutidavemilabowa.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/kudinidut.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/jabarababuvis.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/kovomewodonufujebisux.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/zegenukagadugosimape.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/92153423407.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/derepupubefadajejufamama.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/54719976955.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/volirizowifabunoroz.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/pikoxilijimubaguj.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219333626.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/80371777615.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/18082971790.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/pasog.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/jababof.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/13783747576.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/47769710586.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/xategusefagolob.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/wobepulalisogikugak.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140944825767---20956959753.pdfIn PDF document text
    • http://guchen.ru/d/files/391545952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=compass+apk+fullPDF 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_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 10216 bytes
SHA-256: 0a2b6eb06a4e7a109f7314238c7f2d8f966a09b43f160a7ed60abaab772f796b
font_01_sfnt_off0000e183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE183 18584 bytes
SHA-256: fb21be1250dc4deebb81d89ae5a85c9947f7b89127527be7ce89621b1d0e05e0
font_02_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1