Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51a1cf3f6e85568…

MALICIOUS

PDF

72.9 KB Created: 2021-05-06 20:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9569aa9c427b53ade4c5bb1daafe11d2 SHA-1: d68cbd0669301ca2126e1db5710044df58d28643 SHA-256: d51a1cf3f6e8556840d82ecde55a5e1490ef58da1e2cc3deb218cd908fd4a1bc
116 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains multiple embedded URLs, one of which points to a raw IP address, suggesting an attempt to host a malicious payload. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its lure, but the presence of external URIs and the high confidence score indicate a malicious intent to deliver a secondary stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba28e5b8a---53248691280.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905d40c77cf---pisefizavowex.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac7653611---37738229813.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//40378213574.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4129b78a---mopikedesixapodixobuk.pdf
    • http://anaminfo.com/attachfile/file/86923475952.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/505bb416c420194ac9b834510e243320/71625645095.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d43d64e8e226b4f7734c0faacaf59539/47032139624.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d02ae6883---94784706556.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608298193af6e---fumilefogex.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082b91b5ad83---pigazaluxuvurodukapij.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7ef0554f6786350ff7962715357b6fba/76174243333.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607621186b020---lijudusur.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160873cee55374---31317839995.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076715c17fb2---rusufujomewiwoxudopuv.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606de9285bc78---21625286793.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608db25590017---sepomukolera.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bishop+moore+high+school+uniforms
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d471.bin
da0096b071cab4b554915ce395a3b9095e801dd422f2c52513f36e07ef7f9536		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD471 5068 bytes
font_01_sfnt_off0000e583.bin
56ed7838c347dfdbee937b23bb5399bcc5f7616390963bfb2b3279d4f42dbdc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 10148 bytes
font_02_sfnt_off00010839.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 4324 bytes

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