Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee2be154fec8681…

MALICIOUS

PDF

82.1 KB Created: 2021-03-18 14:25:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78932bab27f6a145f7bc6a408637c314 SHA-1: 33ea9616bbd73fca11ef8129537217cd75bc1364 SHA-256: 4ee2be154fec8681a9e0e31780a68ac65e61cd692761b59ee52263c01b4dc953
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on services like Weebly and s123-cdn-static.com, indicative of a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=fan+yang+bubbles
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/sezukiwejisopi.pdf
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/dojopususomalojezezi.pdf
    • https://cdn-cms.f-static.net/uploads/4486351/normal_605281c8f1d9d.pdf
    • https://static.s123-cdn-static.com/uploads/4391047/normal_5fe40da17431f.pdf
    • https://cdn-cms.f-static.net/uploads/4380707/normal_604b959ab5462.pdf
    • https://bubamixidik.weebly.com/uploads/1/3/4/6/134657394/2389493.pdf
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5fe062a7d47be.pdf
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/f819706063d84fe.pdf
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60144dc4d473f.pdf
    • https://mepefukuwipo.weebly.com/uploads/1/3/4/5/134523025/vurodudilisov.pdf
    • https://lamosafobe.weebly.com/uploads/1/3/5/3/135322951/gudunej-rusasenag-gagokop-fejigo.pdf
    • https://cdn.sqhk.co/duxivutunum/cYhegeY/vozimame.pdf
    • https://cdn.sqhk.co/butemobe/dghhhgf/solitaire_ring_enhancer_white_gold.pdf
    • https://birivisixakaxe.weebly.com/uploads/1/3/4/6/134608058/momesetax.pdf
    • https://cdn-cms.f-static.net/uploads/4420039/normal_601d13cea7eae.pdf
    • https://cdn-cms.f-static.net/uploads/4404975/normal_5fe9f3e0c64b8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pudugivifo.myartsonline.com/29146384867.pdf
    • http://tivexedasabuxi.myartsonline.com/8843051363.pdf
    • http://felugibesixe.onlinewebshop.net/damn_good_friends_quotes.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f673.bin
aa59de8b4f4eddfdfcc617d8ea4928a24e2a42684d49dff1a725a2998ad090b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 3980 bytes
font_01_sfnt_off000104ad.bin
f10497e0590c54afa00b69de554f7648780d95613f7dd84c96abcbeaa7d1aa18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104AD 4956 bytes
font_02_sfnt_off000115ad.bin
fab01cbb882d4ac84ec56e399acc681e284f0de4361efafc66142a5c89f4b523		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 11052 bytes

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