Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36e268b6f4042e5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 12:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b09d4d15b67bc58e91e36a3cf605f816 SHA-1: 3023e3e9eafc741504d32eddf6cab8bb1b778ac2 SHA-256: c36e268b6f4042e50b9c6aff13909388fc3d7381ccbbaeae4bd5fb5eb0ca6084
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://dydlhx.com/upfiles/file///vunitukez.pdf
    • http://canadianartistic.com/userfiles/file/34799220014.pdf
    • http://herbexindia.com/ckfinder/userfiles/files/37255337940.pdf
    • https://hobbes-group.com/upload/files/60615068321.pdf
    • http://pacemakerpressintl.com/uploads/assets/file/18531438625.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/linevofij.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qhun0ls6jqfanihis2ibtggc0d/ramuwa.pdf
    • https://inprovitcolombia.com/ckfinder/userfiles/files/xadujame.pdf
    • http://cattaneoarchitetti.it/userfiles/files/80107550211.pdf
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/49626317930.pdf
    • http://spharma.ua/files/file/wadutozojogeb.pdf
    • http://ilturismoinitalia.it/userfiles/files/suxejam.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/22521590116.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/61026472308.pdf
    • http://wildzipper.com/clients/wildzipper/userfiles/file/59502311129.pdf
    • https://bawauang.com/contents/files/7453551974.pdf
    • http://asbazainville.org/userfiles/file/lusefovitidovuxa.pdf
    • http://files.ibiza-ferien.de/file/xekatina.pdf
    • https://chasehr.in/userfiles/file/tifegixez.pdf
    • https://griby.biz/ckfinder/userfiles/files/32700359075.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12158285596.pdf
    • https://nutstudio.it/userfiles/file/gogul.pdf
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/32481976510.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/69265036770.pdf
    • http://capri.lt/userfiles/files/70891041512.pdf
    • http://lt101shop.com/userfiles/files/47990652375.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=uphill+rush+7+unblocked
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdd6.bin
fc4877189560f7e3a96bddb89c0b977c6f19009c2a9405be2895e99c1b06be4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD6 15560 bytes
font_01_sfnt_off0000e53f.bin
a519190678a4a71580f2b2f4d24f99fafd619a6ff8533cc96e8ea0242540359b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 10740 bytes
font_02_sfnt_off0000fda0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 16792 bytes

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