Malicious PDF — malware analysis report

Static analysis result for SHA-256 862b75077f183200…

MALICIOUS

PDF

74.6 KB Created: 2020-11-21 23:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 626133eb0cbe7dab28fd679198691687 SHA-1: 977df78d973f57886cb41432421a3d4f8edb9b11 SHA-256: 862b75077f18320011832305aaedb93f2ae0e5aa7dbeb0bf05ee2e4a786011d2
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for phishing or SEO spam. The presence of 'Clash Clans apk day1' in the document body suggests a lure to attract users interested in mobile games. While no scripts were explicitly extracted, the PDF structure and external link farm heuristic suggest potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://traffset.ru/123?utm_term=clash+clans+apk+day%25C4%25B1
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/vevumisomus-ditukuwazapom-joveba-begibenura.pdf
    • https://sujexixapobitu.weebly.com/uploads/1/3/4/3/134328704/suvekaga.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d065ec14-fde4-4fd6-98a0-f00945c5964d/giants_in_minnesota.pdf
    • https://s3.amazonaws.com/luramamelolem/36624254756.pdf
    • https://uploads.strikinglycdn.com/files/6283f699-f33e-4533-944e-25ea10e455c4/17984509673.pdf
    • https://s3.amazonaws.com/fatikonavori/99462909708.pdf
    • https://s3.amazonaws.com/firigugixujotov/what_is_ic3.pdf
    • https://s3.amazonaws.com/sinadi/windows_update_error_80244o2c.pdf
    • https://s3.amazonaws.com/zuxadol/zaxabenurevo.pdf
    • https://s3.amazonaws.com/peveziwoguxuzam/7th_grade_physics_review.pdf
    • https://uploads.strikinglycdn.com/files/fa66f001-5531-479c-a99d-62d5f653c9d6/bubiridizojaxavesotovurem.pdf
    • https://s3.amazonaws.com/retobifulipo/gemonijo.pdf
    • https://uploads.strikinglycdn.com/files/9a9670c0-16f3-4413-bf59-b6dc22f6b4c5/go_math_grade_1_teacher_edition.pdf
    • https://s3.amazonaws.com/kulinisokakewi/wow_legion_strategy_guide.pdf
    • https://uploads.strikinglycdn.com/files/a2a78f6d-2b35-4593-8f72-a36f7e2ac728/mamalilifov.pdf
    • https://uploads.strikinglycdn.com/files/68a03af3-61c3-4cfe-b04c-e6ab5f4451b5/wudopob.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1aa.bin
3014df1931f7fcecdaade1cb190796aa3399b4f592fca399697f850f3de553b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 5168 bytes
font_01_sfnt_off0000e343.bin
a794f3d8033b63aeba373b3d3f97c63782a0e50b9bd8a307e38d9cbec9d5e78a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 10984 bytes
font_02_sfnt_off00010731.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 16060 bytes

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