Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c5ace21693c19e…

MALICIOUS

PDF

80.5 KB Created: 2021-01-09 23:18:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 18a640c609f810ceae9f3dd5fe0434a7 SHA-1: 94acd4840fcb654973970ada180d95a3fbd68800 SHA-256: 67c5ace21693c19ed3567953d3830ac07eb9f2372b8533b751f2f37916370a2e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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
  • 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.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=gy-+30+light+sensor+datasheet In PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/e947ae1d.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/igt7gfA/blaze_of_battle_hack_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vinusubat/YC1lMGS/making_wood_joints_with_router.pdfIn PDF document text
    • https://cdn.sqhk.co/faxenukev/wjcShcp/13205856039.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/ibdSxia/diwawomukuwidewet.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/voxexinelosiremejas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedimuta/bolunax.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/important_full_forms_a_to_z.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/capsim_situational_analysis_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/2098367077.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/bristol_stool_form_scale_diarrhea.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/32401800710.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/asia_countries_and_capitals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/27461584665.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/27142357963.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/18884662560.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 5556 bytes
SHA-256: 884341f429dc0e0ba2ae0613993b614c5b8b203b71d2f25ef12ec0e9a39b063c
font_01_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 11640 bytes
SHA-256: d6b893806e196cdf189c22ab88cc04f82b0251bc5a3ed06eccf3958fd88ee2db
font_02_sfnt_off00011f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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