Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bddebaf5a8fe15…

MALICIOUS

PDF

79.5 KB Created: 2021-03-21 21:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 294689ad2e40580a919a9d9f7b0ad44d SHA-1: b06472fccbe752b32a9351d65529b080626cca5b SHA-256: 18bddebaf5a8fe1535bf73a6cb850bd1d5a7a344ff58c3abfce5af9a4bd34697
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. The embedded URL 'https://zajinet.ru/wix?keyword=build+an+atom+phet+lab+worksheet+answers' is likely the primary lure, attempting to trick users into believing it's a legitimate resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=build+an+atom+phet+lab+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4384164/normal_601b51d36db1e.pdf
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/nipisu.pdf
    • https://cdn-cms.f-static.net/uploads/4488574/normal_601243ce40f8e.pdf
    • https://bifezogutagu.weebly.com/uploads/1/3/4/5/134598372/0d043e.pdf
    • https://vewudati.weebly.com/uploads/1/3/0/8/130873955/651874.pdf
    • http://buwewava.iblogger.org/kigowobagofute.pdf
    • http://tisibodonal.22web.org/57891877842.pdf
    • https://wenebuzonuk.weebly.com/uploads/1/3/1/8/131857431/tuvusilerib_gudonafutemusu_boxefus.pdf
    • https://luwumevawosa.weebly.com/uploads/1/3/5/3/135322316/retebifazewebo.pdf
    • https://cdn-cms.f-static.net/uploads/4478932/normal_602d711f6c269.pdf
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/2061557.pdf
    • https://static.s123-cdn-static.com/uploads/4373239/normal_5feb964fafb0b.pdf
    • https://nevofegef.weebly.com/uploads/1/3/4/8/134851200/felejugipa.pdf
    • https://kogezuzoxato.weebly.com/uploads/1/3/1/0/131070880/nizilamup-zigipeg-gibenezigol.pdf
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/2914580.pdf
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/99a40a.pdf
    • https://static.s123-cdn-static.com/uploads/4480187/normal_5fcea02fdf968.pdf
    • https://bivolureru.weebly.com/uploads/1/3/4/5/134583024/9479364.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tujeviwakirawu/facebook_auto_like.pdf
    • https://s3.amazonaws.com/tetenifeme/71656947648.pdf
    • http://fukasutatota.rf.gd/32417901929.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_off0000e373.bin
a32b8feeddaf553564c78d11ebf2fc8b87ccaff4ae44dd6392dd3f15d026929e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 5544 bytes
font_01_sfnt_off0000f629.bin
f50e05fc410e0445276561ccb505dd1deb9703928a387657d70b86e3c5e7e7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 10756 bytes
font_02_sfnt_off00011b39.bin
bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16036 bytes

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