Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca59fff23f4abc2a…

MALICIOUS

PDF

77.7 KB Created: 2021-03-14 19:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 932ef44501fcb89b9d16de8c3b9df276 SHA-1: c00c2eac48aed2ca7ac7e99d69b32679fa853fea SHA-256: ca59fff23f4abc2ab32a65ec7c01c9ab956013efc52fbc8db8eab7b3932b9f1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting a link farm or redirection mechanism to host malicious content. The presence of a 'download button' heuristic further supports the lure aspect, aiming to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/award?keyword=reading+ielts+exam+pdf PDF link annotation
    • https://cdn.sqhk.co/ponesigis/hig8zjf/dasonure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5ffd56fcd356a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375206/normal_604b024ec5303.pdfIn PDF document text
    • http://xariketixagat.mypressonline.com/bid_management_process.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5fdf8cf9c9dbd.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/elQ2hdG/bubikozusuwolax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383582/normal_5ffeb7d890d7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_6016194abe4cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_604cd7de26a59.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5ff9b58f4530a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5feff61fc32e5.pdfIn PDF document text
    • https://cdn.sqhk.co/terisuzuji/bTqOlhg/7309057473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_6035d5f97e4ec.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/wevigizosuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_6045be60324b8.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/djjAXTY/bowinuvubizusuran.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468259/normal_6002b8c01beb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445882/normal_5fff974619bd8.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/boviwokiratake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465701/normal_5fc748cf23c2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_9495a688152e41599e40b46bfde28769.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_75fe3c3644f44883a2b1b7adf8fb772a.pdf?index=trueIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/evermore_alyson_noel_ita.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_dd2f4a9b98fa4160ade8d389d66df4ed.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_9305ad7181f84884a79014e3ca561de2.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_0018b31b24e54c028ba02f02ce4bcdd8.pdf?index=trueIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 5340 bytes
SHA-256: f6f2dacd9061f4cf928dd0522d824d2339acf29acf466c41ec266526a13599a2
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 11148 bytes
SHA-256: 1676bdf45724c3b1e7262ac1b1c8792fcf7b634c4cd596cefb05ff88414d839d