Malicious PDF — malware analysis report

Static analysis result for SHA-256 608b9cb6c71ffe5b…

MALICIOUS

PDF

79.7 KB Created: 2020-12-04 02:59:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 246993ebe8627410f470e90f2e991ee1 SHA-1: 15446a9411bdd88b152261f49bd58fad7511c069 SHA-256: 608b9cb6c71ffe5bfb318a04b13fea64c7308b5bbed1d1447fa2c465de86f5a5
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=efectum+pro+apk+slow+fast
    • https://bizevino.weebly.com/uploads/1/3/4/3/134320064/2cede2ad616.pdf
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f87150f5bffe.pdf
    • https://cdn-cms.f-static.net/uploads/4382412/normal_5fc2d0c7c98f6.pdf
    • https://miwomineferele.weebly.com/uploads/1/3/4/5/134514444/2272153.pdf
    • https://cdn-cms.f-static.net/uploads/4462351/normal_5fa61c60bfa86.pdf
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/tejabekijikutom.pdf
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/81943c6a99c1.pdf
    • https://dejaxunex.weebly.com/uploads/1/3/4/3/134318563/4169275.pdf
    • https://cdn-cms.f-static.net/uploads/4449777/normal_5fbd99a72fe22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sazariwapa/20603467451.pdf
    • https://s3.amazonaws.com/vatosolikijike/bemefajat.pdf
    • https://s3.amazonaws.com/woxorojero/61596332986.pdf
    • https://uploads.strikinglycdn.com/files/d1cb88ce-9041-47fe-be79-67e76cb72b97/dallas_flea_market_dallas_north_carolina.pdf
    • https://uploads.strikinglycdn.com/files/06033a76-a4ec-41ce-8784-0444c50c4d32/98327700109.pdf
    • https://s3.amazonaws.com/zategafozasiru/budgeting_meaning.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde9.bin
ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE9 6744 bytes
font_01_sfnt_off0000ded1.bin
be14e58e6e16725da71baad26b196d43d5e2f817491080f6e76cbc98a5d68427		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 5276 bytes
font_02_sfnt_off0000f0c4.bin
ddbe098ab296dcac8ed8b2a46cd2d9f9eeaca3ea456a5ff08c24096372689197		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 13500 bytes
font_03_sfnt_off00011bbd.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 16312 bytes

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