Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad85ceccf9eebd0b…

MALICIOUS

PDF

73.0 KB Created: 2021-05-08 15:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4528ae69b40b34c394cfd897ca226f23 SHA-1: 7ec0aecf93871e8930d5849861c562e9e6637194 SHA-256: ad85ceccf9eebd0bf6caa349e8cc2c6e70e11de0d6fbdc95372d7e131a1f4fdc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document attempts to trick the user into installing remote support tools, which is a common tactic for phishing and malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://zajinet.ru/strik?utm_term=ic+756+pro+ii+mods
    • http://pewujok.mypressonline.com/cbre_report_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4426686/normal_5fca8d174fca5.pdf
    • http://wetebopoxegubu.iblogger.org/adobe_audition_1._5_apk.pdf
    • https://cdn.sqhk.co/gofelaxes/jMuUjgn/2779593886.pdf
    • http://durowan.sportsontheweb.net/24833096385.pdf
    • https://cdn.sqhk.co/puxedimuwo/jb1tLgf/38119752833.pdf
    • https://cdn.sqhk.co/jimumakevaji/iieqEfJ/splashtop_wired_xdisplay_alternative.pdf
    • http://bukipanugub.iblogger.org/tunegugaxosuwum.pdf
    • http://benodemutuvi.22web.org/tifofezuzedimixidevu.pdf
    • https://cdn.sqhk.co/fusozuwalas/dgF7nEN/lanigikevefigozilexakev.pdf
    • https://cdn-cms.f-static.net/uploads/4461483/normal_606e52453eef9.pdf
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fe1fd51e9e32.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://maxezexisog.rf.gd/dodonamulud.pdf
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_a937a832edd74996b50e42719f7415b1.pdf?index=true
    • http://nidotezuk.epizy.com/dipugedomufoze.pdf
    • https://edcef860-f8c5-4905-824e-468e777b1324.filesusr.com/ugd/99b222_20a9dd77956c4c2f842a28ca6c2049db.pdf?index=true
    • http://zojopek.epizy.com/rafur.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6c.bin
aa2df9013171700268fbebabd03adb05c4c6027e793d977dc2b81e0de0915f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 5272 bytes
font_01_sfnt_off0000f053.bin
2e0e36d7f4c2a79ea9b5b0a599592ccdd0eb1f073f15dcefa6d4669b98ecb767		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 11396 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.