Malicious PDF — malware analysis report

Static analysis result for SHA-256 408f8dc6cb9397a5…

MALICIOUS

PDF

84.2 KB Created: 2021-03-01 22:46:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a5ac7bd41bc48bf9c07e59a88279dd32 SHA-1: 5c2263ce4e94486616d60738ca08f02f82a5a3c2 SHA-256: 408f8dc6cb9397a5cdb40c7d29a91a3ff76a2da84d24aac0d6f4101070214826
144 Risk Score

Malware Insights

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

The file is a PDF that contains a lure, identified as a "free-download phishing" attempt. It embeds a URL that redirects to an SEO redirector, specifically 'https://zajinet.ru/wix?keyword=cuddeback+long+range+ir+manual'. This suggests the document is designed to lead the user to a malicious site, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cuddeback+long+range+ir+manual PDF link annotation
    • http://richteam.site/babbo_italian_eatery_nutrition_informationx43y7.pdfIn PDF document text
    • https://cdn.sqhk.co/zujumatatub/pP4jcia/5k_race_time_conversion.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/84464459845.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/2005_nissan_pathfinder_starter_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/ejajbig/war_of_the_zombie_money_cheat.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/mevuzokekenojab/autodesk_revit_training.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/42612276092.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/heise_notepad_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/distressor_el8x_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/gawujugawigibituvanesilo.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/how_to_win_friends_and_influence_quotes.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF697 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 5108 bytes
SHA-256: adc9f9753786c056ab3f4543cb4e8cdbd6d12c184b774d807c5db78f698cf131
font_02_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 9960 bytes
SHA-256: 372488e41dffb0c96c3d14ffe67a98c403ce7be6ea87475235e1a13a7d9fcc90
font_03_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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