Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf235ea8ef978dd…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 16:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a99543bc7a3d792ad469a130deb31f5 SHA-1: 9b40f979863fb1590b6ae3d7cf892d7cc665bbf6 SHA-256: cdf235ea8ef978dd33b9a768ee3a1e50c85d3df44f1dea980365b5b842cd16e6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic identifying it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL identified is https://midufefew.ru/award?keyword=oral+presentation+example+pdf, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=oral+presentation+example+pdf
    • https://cdn.sqhk.co/mumepefofise/FYQdjjO/infographics_templates_free_ppt.pdf
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/4097783.pdf
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/95f08f6ec.pdf
    • http://dogosufomume.iblogger.org/felokosumalubisu.pdf
    • https://nupetumagapet.weebly.com/uploads/1/3/1/8/131859993/dojazugeju.pdf
    • https://cdn.sqhk.co/ramawuvade/Sig3xRT/30346737053.pdf
    • https://ligumanu.weebly.com/uploads/1/3/0/7/130775644/4ba89eb24a88.pdf
    • https://rijadotijijani.weebly.com/uploads/1/3/4/4/134470018/cbd92882ca307.pdf
    • https://cdn.sqhk.co/vipujitebiki/jhQgdBA/waduxaninoremazas.pdf
    • http://jegipebor.iblogger.org/lettering_practice_template_procreate.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mivowejow.rf.gd/23359217265.pdf
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_01036fad0a594226985d5525a4100eef.pdf?index=true
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_7dd53152e2144f9cbd75f950c181a154.pdf?index=true
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_a455993d6cbf4b6284f36dbff2053d05.pdf?index=true
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_8af627618a1f42bd9f7f32a0ef644956.pdf?index=true
    • http://lutubipejor.rf.gd/80093085333.pdf
    • https://s3.amazonaws.com/supefujoxopubu/20356562569.pdf
    • https://s3.amazonaws.com/mamibis/92848931619.pdf
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_7004f3985f25415693b01ed6109b1db5.pdf?index=true
    • https://s3.amazonaws.com/towakog/zulupufuvasalenaxuxe.pdf
    • https://s3.amazonaws.com/kifutizijebuj/bed_bug_report_florida_hotels.pdf
    • https://s3.amazonaws.com/zafirawit/54060683152.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
    • 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_off0000e581.bin
92be3c00078c86ede73caabd9f66e3213e46c4536740d21d8bccb58a7ad852e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 5280 bytes
font_01_sfnt_off0000f75f.bin
1f7581cb268c860c419216160e8aa3eef08d4115c364ea2f1bd898c7ed5bdfbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 10628 bytes
font_02_sfnt_off00011ba6.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 16060 bytes

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