Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4122ec93cf0e97…

MALICIOUS

PDF

72.5 KB Created: 2021-09-21 15:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89bb7df584374fabfc18807bec7f2921 SHA-1: 1a09f34062cb36dd62af2dc1a1c9a2fba7e28cbb SHA-256: 1a4122ec93cf0e978e102e8285d1817d92011e5c61dc3f80c3bc8e5418eeffe3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=gulzar+shayari+on+life PDF link annotation
    • http://redondoclassicburger.com/uploads/files/lelisotezazamufidukiweba.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/batitutozuseremis.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/nawasitutal.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/95678580711.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/bozotadukidaret.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/vosenenuderedixefitimid.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/budarejaduwuvodirigenokuf.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/32326738137.pdfIn PDF document text
    • http://rs-entp.com/upload/file/gilujilarudoji.pdfIn PDF document text
    • http://sinners-party.de/media/file/bofapatet.pdfIn PDF document text
    • https://tl-systems.hu/files/files/vefurusepasowesefitamido.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/92527208491.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/mudoferobimimo.pdfIn PDF document text
    • https://nyig.com/files/file/gulitatoleposino.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/kiwusojumewuzuwunej.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/93642234266.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/92419314428.pdfIn PDF document text
    • http://neuroxl.com/images/file/6196966500.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/xaxuwa.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/bowulizixavuxisepokig.pdfIn PDF document text
    • https://pellevah.com/upload/files/8182931844.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/97253002943.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a21476d36---zejuzonimuxoke.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_off0000b5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 17812 bytes
SHA-256: 906db0f91763cdda17d30d8054807449658ec9952d2307a141099add441a44f3
font_01_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 10528 bytes
SHA-256: 914e94ff267a9c93e93cf5beafc47f3e93b67186c970855db1aa82f3f4537129
font_02_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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