Malicious PDF — malware analysis report

Static analysis result for SHA-256 633702e752a55d29…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 21:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6059f124ab108d6c1cd91a7e3996ef88 SHA-1: 96d75e432ec4eab4ca3c0ddcd085177254e67a91 SHA-256: 633702e752a55d297a38294ade322c729d64274a78e773998563344eaef14e2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the sheer number of distinct, unknown URLs suggest a deliberate attempt to create a link farm. This pattern is commonly used to distribute malicious content or conduct phishing attacks by luring users to click on links that lead to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dragonera.cn/admin/userfiles/file/xudedaz.pdf
    • http://szyqjsj.com/UploadFile/file/20210918051615127.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/gidabodezolelod.pdf
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/87157685258.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/23927458459.pdf
    • https://gdaniec.com/upload/files/bedutikenejegavuxok.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/20984035920.pdf
    • https://georeno.ca/userfiles/files/zuxinobeg.pdf
    • http://showpelec.com/data/file/20210907_060626_385.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/cn7jocaa3anc3euo4bjtvoe1j1/7631500613.pdf
    • https://etevent.itweald.com/uploads/files/613cfb1e30046.pdf
    • http://tysons-cafe.com/uploads/files/88934599198.pdf
    • http://519pf.com/userfiles/files/sesofusujifa.pdf
    • https://war-old.its.vn/new/userfiles/file/75858912449.pdf
    • http://rfinshaat.az/userfiles/file/merawexawalatexus.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2ca258cfcee51f42851cba84103f6ccb/49769070930.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/veronu.pdf
    • http://dailitara.lt/bites/uploads/file/24171065834.pdf
    • http://hanyuchina.com/upload/files/jopudejawifoloramasiriv.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/fifewawaxadasewawubiz.pdf
    • http://vinhthuan.asia/upload/files/golemetemoxosevixisaxuz.pdf
    • http://polimak.pl/userfiles/file/saduwib.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=zombotron+3+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_off0000da5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16792 bytes
font_01_sfnt_off0000f26e.bin
cc3e08ba59ce75a6bb1be0fb32e4d55286c7fbffd1ad9d15d999d32aa346b6d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 19600 bytes
font_02_sfnt_off000125fc.bin
f0f57d6c7e0f3f23abdd33cc3b49e96465f3d959431b628a8c91dea3c85c6caa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 10576 bytes

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