Malicious PDF — malware analysis report

Static analysis result for SHA-256 d933a74ed2585044…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 15:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d80b03cd7f74f78ba575723cf98b7f4f SHA-1: bc81f30a3c0518bd1c247113f4ea14b287409dd5 SHA-256: d933a74ed258504447ff489843e311a167cd102ceb4d46adb6df1a5f9675f198
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=download+mashup+apk PDF link annotation
    • https://jnnjhansi.com/userfiles/file/jiwibeworivagokukurinuvan.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/gososet.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/kebagu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10138371690.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/tosiwan.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/pigulubuxenesufa.pdfIn PDF document text
    • http://compsult.net/userfiles/file/memanupewomoxaxoxew.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/556315692.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/noraxosejog.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/60715504291.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/fetulaxaxuluros.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-6/20210906182842842975.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130125132357---fazog.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/11190516434.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/32667988563.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/2347778205.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/teduroxaxowudawojorubez.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/3962626524.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/75389985659.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/12074399868.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/fakidiwaxumig.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161377e56bfbd2---75177781785.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/dusejodobuzorot.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/nonaxafij.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/dopezekuwamo.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kaxobuduvadatuk.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/38711983362.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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 18336 bytes
SHA-256: 513e8c590ed486a2184437734265837f5f1dbd213dba3bebe84d864d902fe58e
font_02_sfnt_off000127e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 10512 bytes
SHA-256: edc1238417bc0da3554f704649b71df27fad21153c3df95d1af6bc81cbcc9bf7