Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacc3d3721c91d5f…

MALICIOUS

PDF

80.4 KB Created: 2021-03-14 06:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a324b3cbee5358b2730bcb82b8614cd6 SHA-1: a33699853cb436361675fc4109917e4b75954244 SHA-256: dacc3d3721c91d5f06354bcb766f5b1f259f0262e8ce9126fac2f0cc34f298d3
196 Risk Score

Malware Insights

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

The file is a PDF that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common method for distributing malware or stealing credentials. The presence of numerous external links, including one to 'zajinet.ru', suggests a phishing or malicious redirection attempt. ClamAV also detected this file as Pdf.Phishing.Trojan.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/wix?keyword=uc+browser+apk+download+free
    • https://vokoziga.weebly.com/uploads/1/3/4/3/134389491/kowifun.pdf
    • https://gununoneku.weebly.com/uploads/1/3/4/3/134309052/4590506.pdf
    • https://jisawawaxiwibes.weebly.com/uploads/1/3/1/6/131606947/820e8.pdf
    • https://zumizosapozogem.weebly.com/uploads/1/3/2/6/132681504/matuno.pdf
    • https://cdn.sqhk.co/mevazasid/kjijjha/99218252621.pdf
    • https://cdn.sqhk.co/bidusowo/eifigQP/nutawonibijeruzoni.pdf
    • https://pegelukiratek.weebly.com/uploads/1/3/4/5/134503056/d8b70c1f0ddb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazuxujepov/carlyle_group_annual_report_2012.pdf
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_c4c439469fdd44a98c097a4d7ceb4ccb.pdf?index=true
    • https://s3.amazonaws.com/vudivuzakal/kinotozegibufumakumakes.pdf
    • https://uploads.strikinglycdn.com/files/2635a277-9b93-4095-bcbf-b980ff6f1dea/high_school_be_capitalized_in_a_sentence.pdf
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_a5452de61ac443449a5eb3750842ed8e.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_be65ee54ec2f43c9bcc786f898f0121c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b13fbea3-05a0-491a-a37c-b132c6878722/what_does_metaphorical_mean_in_writing.pdf
    • https://s3.amazonaws.com/gifiz/kaikoura_weather_report_today.pdf
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_232a98ac7d9c4e3594e08e039f4cd346.pdf?index=true
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_3740ea02b5fa4afbb8a0ae9ae0a454a1.pdf?index=true
    • 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_off0000e5af.bin
c3f227a5107847e8d22584b1b8bf5f89bd7481a73ebdba300689c6b8bcda78d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 5436 bytes
font_01_sfnt_off0000f84f.bin
29696f943c05b09cce26cfad94284618db3d01b16277c4eea46e3bd8d260efaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84F 10884 bytes
font_02_sfnt_off00011dbf.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 16092 bytes

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