Malicious PDF — malware analysis report

Static analysis result for SHA-256 efff60d86b6f9558…

MALICIOUS

PDF

80.7 KB Created: 2021-04-14 10:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 896842f710015a5dd4acb5d802cbd44f SHA-1: 6f01e4437680c79d152906a59b35b166eec8f5ca SHA-256: efff60d86b6f95584467544ada9749e86b7990549ec7422fb212a7b25ba93d2f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://crophysi.ru/strik'. This, combined with ML classification and ClamAV detection, strongly indicates malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=service+oriented+architecture+%2528soa%2529+for+dummies+2nd+edition+pdf In PDF document text
    • http://lasiwefomibew.sportsontheweb.net/south_african_schools_act_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/gfidijj/9927459039.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/dhjYuia/87118007007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460686/normal_5feb0407a9ff3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5fe1c17b5cd14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pasutiz/73977204201.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/75483790310.pdfIn PDF document text
    • http://fadezanunadafik.myartsonline.com/49605685188.pdfIn PDF document text
    • http://luvotirapanuza.rf.gd/rasidulubukiza.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/suwesuvisidirilitom.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/craftsman_315_garage_door_remote_programing.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/83396735692.pdfIn PDF document text
    • http://mifevup.rf.gd/rebasupigometusovilosan.pdfIn PDF document text
    • http://zotitutuxizokox.epizy.com/bams_second_year_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/wugupizasunenul.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 5696 bytes
SHA-256: 0d6efb004adf274a05dc57b687b5b1db41b2d1e60827845a0ea0d134e6585ae1
font_01_sfnt_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 12508 bytes
SHA-256: b1fd690ab56baf23fb71b07aad493f428d4706b0f22c24d9723f1827c6152520
font_02_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 16172 bytes
SHA-256: aa0b82774e64aa1267dcf33f62c559795accb6392120fe66198aaac27bb22be0
font_03_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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