Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47addecb46f42ff…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 20:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2bf9b744a3ab187987bbfe4c12fb7dd SHA-1: ed25d006b7ec2ae8cd6d2ad77f64fd5495e91d5c SHA-256: a47addecb46f42ffec5a6b69465c3d81c547568d9f717d6e7f39a83775ff42a5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://yey.uw52.com/upload/files/29804551420.pdf In PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/47862259134.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/buvuwawad.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/jofibuvusime.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/vosezijinani.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/45631019394.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/nufaredi.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/sarikowuv.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130ceedbb19d---32358717606.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/40629263195.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/fafijesa.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/77554687191.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/57297945664.pdfIn PDF document text
    • http://huntland.hu/upload/file/kulimug.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/45288494890.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/28744371280.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/fikemuxebowixalutivaxi.pdfIn PDF document text
    • http://sswjeans.com/files/vajumefumozodoregatiba.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/57063722637.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/75312095942.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/15263057616.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/zolesox.pdfIn PDF document text
    • http://ruresept.ru/files/file/jerenufibibetaj.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/jutofagatugevuwiworoze.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/wizewetagazasadil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=jeeto+play+free+games+apkPDF 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_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 17904 bytes
SHA-256: d2a235872e5c4c4f0073c43d70ba12166c2e34f154e4165c9441a3d26b4591be
font_02_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 10704 bytes
SHA-256: 987a13ea3af6b34ee5916ba5e1d59d13fdfbc64aca35c3dfdaa11829bb4b984b

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