Malicious PDF — malware analysis report

Static analysis result for SHA-256 919d289576fd2e1b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 11:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc6da55eebec6a53f46ccf3932487b5d SHA-1: 058c65d4954a543b397dae074d653ab79482ca82 SHA-256: 919d289576fd2e1bae5976863dfbafa04e489c373cb5f87628f61f67f72b5eed
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on various domains, suggesting it acts as a downloader or redirector. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=keys+cafe+apk+latest+version
    • http://jocoseatee.com/userfiles/files/vavup.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f4f34414c---zajudanijunexazeduxoguxin.pdf
    • http://sskj.pl/userfiles/file/motuzazupimejagepobefa.pdf
    • http://ergakiland.ru/files/files/xifoxozobalolorimogeri.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/sinkthtbedljoqvisratmjma0svr82pk/kelitekoxidinemokapifoget.pdf
    • http://geometracosentino.com/userfiles/files/42834926794.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/gidekagugu.pdf
    • http://xutricolor.com/uploadfile/files/74720174567.pdf
    • http://tnslib.tools/userfiles/files/livixox.pdf
    • http://vivatbacchus.hu/files/file/72764989221.pdf
    • http://0-50.ru/userfiles/file/66602937547.pdf
    • http://abwmarlboropike.com/uploads/files/60845666869.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/32905712302.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/gogukugirexel.pdf
    • https://aronabritcan.com/userfiles/file/xolubemogisinirow.pdf
    • https://lazdynumokykla.lt/userfiles/file/91648498340.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210904070248.pdf
    • http://teplospectr.ru/images/files/21442229810.pdf
    • http://xecuoihuyhoang.com/uploads/userfiles/file/pasoxu.pdf
    • https://nbc.com.vn/ckfinder/userfiles/files/53645424222.pdf
    • http://korea-labels.com/ckfinder/userfiles/files/rawojavepeni.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/33411758657.pdf
    • http://dotacjedlaoze.pl/userfiles/file/mujabaretuzeloxexal.pdf
    • https://hotnews.md/upload/userfiles/files/sunuxikukiride.pdf
    • http://dominant.name/userfiles/file/6824782305.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/livebagonud.pdf
    • http://herve-coiffure.ci/files/52143676448.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://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_off0000d9d0.bin
a5ab0f2c3e900febe2d03a07fd30e57512e0e48ce99b679a1a346e502f6e5c9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 10736 bytes
font_01_sfnt_off0000f2ab.bin
82fa04224ef19ed5d56621a6fc0032424eb2426a44e3627c212aa017577926dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 22012 bytes
font_02_sfnt_off00012b2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 16792 bytes