Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cc75038ae82ea4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 14:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6cb1984fce06982f035ba5d0c8af7898 SHA-1: ca2a50487098f8f935917381a35d492087a582e0 SHA-256: f4cc75038ae82ea42ebb203400999efb9c1d15993300dea0de5f8284dc751100
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://worldwidestationeryholdings.com/files/file/57609776514.pdf In PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210918_233423.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/97168478736.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/53785032332.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109200834123929.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/3151899447.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/52643470075.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/67155743289.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/mujililavid.pdfIn PDF document text
    • http://imaginove.eu/data/Files/pozojefebima.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/kibezemojabefu.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/41895583892.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/mopizajadolezodasunegu.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/10717290967.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/50757777588.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/90265400847.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/wigebododewatasujoro.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/ruxisagewikidideseferugi.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/jegibupenidabikutodabo.pdfIn PDF document text
    • http://szjg.hu/images/file/pididatibowezubapo.pdfIn PDF document text
    • http://josquin-capella.de/download/4519134259.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/25385444520.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/4371547109.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/zuvelavodisumupevosalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+movie+collection+app+androidPDF 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_off0000b343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB343 16004 bytes
SHA-256: 070e236116b7cc83eec34c6c86c6e010d09e82a28288ac030f979148f026ed31
font_01_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 10792 bytes
SHA-256: cd0838754bf0490645a6df140def2b717aaeb3251d00dac5910f6ed494af5a9d
font_02_sfnt_off0000f4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1