Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c86590df873643…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 10:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2f5d514ac3301820a7d572480e546be9 SHA-1: 764d5ae9a2b5b261139e41cc36e972724d017af7 SHA-256: 93c86590df8736439e5af93484c77d388656d383c7edd441590d83e1d6321a80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, containing numerous links to other PDF files hosted on various domains. One of the extracted URLs, http://xenangheli.vn/public/files/dutuwafuwunabekalorid.pdf, is identified as part of this link farm. The ML classifier also strongly suggests maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://xenangheli.vn/public/files/dutuwafuwunabekalorid.pdf In PDF document text
    • https://iwanbim.com/userfiles/files/risexekemegomimoxupiluza.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/81108277999.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/88882038260.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/87239475023.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/butiwaganizep.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/xitafekodebuv.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/nujuzugaworovigatakoxezop.pdfIn PDF document text
    • http://12shio5.com/contents/files/fuvidovenojapijoxagidub.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/224274738.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/riwugepinexugipoja.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908102600.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/5496925149.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/75952546479.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/fozivirarofu.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/gitatuxezupilelokivixe.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/numag.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/paduxosorek.pdfIn PDF document text
    • https://hssanesteban.cl/files/nigafizigegumu.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/99711695213.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/pabidamoxokijikinuruza.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/baralusofiwadibax.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/75716608242.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-30/20210930150315111797.pdfIn PDF document text
    • https://novitas.ro/files/ralupimonow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mortal+kombat+x+mod+apk+2020PDF 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_off0000b513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB513 17588 bytes
SHA-256: 1462d0784288642a161cf2c8aab409b15f9786f7dee733180f4719d8d79e66ad
font_01_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0D 10628 bytes
SHA-256: f106bb6fb6816bb2d9d513d044abd7986a82d8a1379a62ad1b105d65a619b677

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