Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbb901b24ec469c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 06:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0611e1a39b9793e0e371d71f3c384e1b SHA-1: 65ec644d9f50bd035275cb4075c4ae8c2f2caca2 SHA-256: afbb901b24ec469c0bbda41cab547f3a0ab3afa4b1de1ec5464ef191e67e5cbe
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 disposable domains and are structured as link farms, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://cedule-plachty.cz/files/file/ziborasef.pdf In PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ja48vkcl86ri81hhq94s6j87k2/fitaguvejovakosi.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210912093821.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/10141828377.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/45633158868.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/rabulesigoxeli.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/36717371936.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/55864994303.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/dekolevupedasidetitemape.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/23856284062.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/17399148291.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/80396803789.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/dimezumepevedepunezazok.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109021732243062.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/femomasesu.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/wopitamedojipi.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/53878175829.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/xinagozaro.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/83625423850.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/18794409684.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/lituzifumarovew.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/54463498629.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/64001006654.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/nufiw.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/21614461011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fx+master+premium+apk+downloadPDF 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_off0000bae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE4 16764 bytes
SHA-256: aa900b3f05d552087a9f88ea0100580719911e081c2cc3c6c405b4306874f8cf
font_01_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 10908 bytes
SHA-256: f1997b82b183ef4183c87370d83de3f1c61bbfc6a91c34aecbd9f82053fd5c2e

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