Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e18bd39a096141c…

MALICIOUS

PDF

77.4 KB Created: 2021-02-23 01:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6777e1fecca60289e0fc07cf3e85726e SHA-1: 6eccbe4d65e7d4b68b585d1b0d302fce8320f410 SHA-256: 8e18bd39a096141c568256c4ec2ea01dcd67232522c95f0281810dafb73a46a7
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to an SEO redirector. The primary URL identified, https://jottigo.ru/wix?keyword=foil+characters+in+the+most+dangerous+game, is flagged as a high-risk indicator. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/wix?keyword=foil+characters+in+the+most+dangerous+game PDF link annotation
    • http://mosquito.codes/177183492129v11q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475219/normal_5fddcc1f39d72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488322/normal_602a34ff07c54.pdfIn PDF document text
    • http://frasqen.online/what_is_the_definition_of_communication_by_different_authorstofva.pdfIn PDF document text
    • http://seomagnat1.online/tevufufetumukemvdgr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ff25675dc2da.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
    • http://farilofisimoru.rf.gd/34892880608.pdfIn PDF document text
    • http://zajonosexerubi.epizy.com/sexamuvosopude.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/caratlane_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/dearman_give_fast_worksheet.pdfIn PDF document text
    • http://fevirafi.rf.gd/how_open_safe_mode.pdfIn PDF document text
    • http://xunevonobi.epizy.com/klinger_gasket_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/daramidi.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/74650553658.pdfIn PDF document text
    • http://keladuwuk.rf.gd/www_video_converter_com.pdfIn PDF document text
    • http://rewelasiv.rf.gd/mujokeruxikugenizesa.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A4 5192 bytes
SHA-256: a855508127716bf169520cd11f46a070f7a4aa462350ece503a448cc663e4e75
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 10580 bytes
SHA-256: 732aa1f4396d4ddd7dab3886249fc3d0ba7798d4ef1aef8961aec53d1fd23566
font_02_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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