Malicious PDF — malware analysis report

Static analysis result for SHA-256 0770a38c86340b15…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 13:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d557414cc090ab463b8fe94aaf0f2bb SHA-1: e43a2bd392168172e12198ada61808d6f4184762 SHA-256: 0770a38c86340b15f16f8c547cd5916c2cdb755f444093a8207a217d54d0ae5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, many pointing to disposable domains, which is a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm and the embedded URLs strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://korankertas.com/contents/files/31209127461.pdf In PDF document text
    • http://www.gamylai.vn/uploads/files/44282831845.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/47918655342.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/jofufexuzukedagowakeva.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/75673995036.pdfIn PDF document text
    • http://newshop.jp/archive/file/notagebufinotowawaluvadox.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/74907190300.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/jitabilirugufozeluruxoja.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/warixotakozotipinileto.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/62363556228.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/45191135406.pdfIn PDF document text
    • http://capital96.com/userfiles/file/46106146062.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/92284025375.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/52926984290.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c850095a05---soxonimarovajebapurulomi.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/97541792237.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e74f68f5ea358cba755bf97d4b277372/xosuwepokufijijodip.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/gefuloxozifiwowiloto.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/videpapetiponotubosexemaz.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_100806.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/murebaxuxuga.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/mewofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=messaging+apps+for+android+and+iphonePDF 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_off0000b876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB876 10624 bytes
SHA-256: 57603384284c5c184b7c357f4b574791236be7084f387c8427a61184b9addeb4
font_01_sfnt_off0000d078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 15740 bytes
SHA-256: 19f94e6627cc9324522e2ceb0c42f55293738ff956b5dc901e015d1435a91e32