Malicious PDF — malware analysis report

Static analysis result for SHA-256 f894f70f3e539e90…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 19:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90cbfef110be9f888e63e6198868e505 SHA-1: 2a576570ffb1842fdcbe3fac5e289928ac52c928 SHA-256: f894f70f3e539e904ffa59d7789d7839dfb2adb17811adee56f0f1500abf9956
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URLs, suggesting a phishing or content distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tubesealer.com/uploaded/file/1953966394613837309d1ce.pdf In PDF document text
    • http://dragoniresorts.com/userfiles/34418224143.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/lixujupipew.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10487030645.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/witebaxikawatalarepek.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/77828645247.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/pizusezupefotu.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/vususu.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/gevefaxudumef.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/rasomuponewexewuvuj.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/goxozedi.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/42731265208.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/dunajijawalabafaxoruzox.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/dogugudosusejufiw.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090414155629.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/65q0sh5qk4c6k5c60vvuu5vvd5/karixonupopezur.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/18640151060.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/67058207308.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613961bc5f4a2---penesapesenemikesuwodoliz.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/kefeguwezigi.pdfIn PDF document text
    • https://rosycaffe.com/file/42471385440.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/29613182559.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/4705062961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=movie4k+to+2kPDF 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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 9868 bytes
SHA-256: 6eba72b324ac1213e9fa7f15258df4bbdb402cfb97c2376c607497bf64f08507
font_01_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 21596 bytes
SHA-256: 7d4762dac787491b76cc53b4997fcda44cf57d0a9dfbe8a82372922321f439cd
font_02_sfnt_off00012d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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