Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0b399951dc75a1…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 00:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dce502e107349177f128b30f39dda8ef SHA-1: 3491006e3ae98b74ef4200b72c2906c402178193 SHA-256: af0b399951dc75a1405fef255228c19008e5d4f1315e945c47de5302492b0389
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a phishing lure, including a small file size and an image-only presentation designed to hide clickable links. Heuristics indicate a malformed stream and an image lure, suggesting an attempt to exploit vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sd-olimp.hr/files/genenanoviwiv.pdf In PDF document text
    • http://akademibt.com/resimler/files/rinunagezorolajofiluduso.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/10885569089.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/juzujenemo.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/56376325909.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/19980983746.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/nasagozetibokabo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/94605812635.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613564ce07119---ximatagamipojigupog.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/78024342531.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/zobod.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/30613501367.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/59099133191.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/67760634136.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0738df1c9---95367043424.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/digojidemelilapov.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/sitajefejume.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/17213279352.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/13705752497.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/safomisoviremujoxavo.pdfIn PDF document text
    • https://labelmarket.eu/data/file/62762396055.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/92043633003.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/43432504444.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/75849097738.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/42741805718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dotcom+secrets+free+ebook+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_off0000afd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 10864 bytes
SHA-256: c8eba24737a7fe00fdd6ba223a6deff23c5a0bb3d8395751ee56c1fa0dce8564
font_02_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 14160 bytes
SHA-256: e8ec12b71b18f73f0acc46ef1da65bbd08fea028b97a6ef367bcbdec86637bb7