Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8ef72772050cb7…

MALICIOUS

PDF

84.8 KB Created: 2020-12-16 23:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dd16483f1dc77930e4bebc966baa0e0 SHA-1: 76554b0498dcb4db070a217fccd8bcabfd3aab38 SHA-256: 3f8ef72772050cb700d9eac28f36a9fb2fb584473b3fecd043ca87b34a03a52b
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, such as 'https://traffnew.ru/strik?utm_term=beck%2527s+big+break+hug+season+1', suggests a phishing or content-scraping attack. ClamAV also detected it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/strik?utm_term=beck%2527s+big+break+hug+season+1
    • https://cdn-cms.f-static.net/uploads/4487897/normal_5fc168ba7a9c7.pdf
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/b44808067.pdf
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5f8bbd8ec0648.pdf
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/kenevekazimepo-wotir-woberegazoku.pdf
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/sibatupodelukafabi.pdf
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/6508997.pdf
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/sanosadanonafakifo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5c2e58ef7301f8b324c67/t/5fd0a4923bcf75077a86ee19/1607509138741/celebrity_cruises._co._uk._drinks_packages.pdf
    • https://s3.amazonaws.com/jadudusujuje/college_board_website_sat.pdf
    • https://static1.squarespace.com/static/5fbffb332bbd740658015355/t/5fc148d1e18c5c478e2b71ff/1606502612353/kopoxijatolivuj.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd006b45ca4f790266bfdb/1606221931719/98591876780.pdf
    • https://static1.squarespace.com/static/5fc50ae4a13a450bab0f051b/t/5fc5b8fdbc819f1cf49ec41c/1606793469640/gosavusudawibigep.pdf
    • https://s3.amazonaws.com/mupuraregonu/wazijip.pdf
    • https://uploads.strikinglycdn.com/files/066af4f5-418d-45ca-8e49-1598f2fcb5c9/75315715062.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ac.bin
74f8d12cbef5a8dc4862e862f4233220dee491c583c713b8cbe8826d1badf724		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 3244 bytes
font_01_sfnt_off0000f068.bin
0a1fd4a66e27616c5714926efd763a85e41b2783c8048a665db4ed5ac462935c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 5368 bytes
font_02_sfnt_off000102b9.bin
7f6e7d9db0ce0d84f95cd893cfda045e05ebc521a6a8deac154ba1b420e6c957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 14960 bytes
font_03_sfnt_off00012f02.bin
eb67323a3edc51f073cf7ae7c668a4400309481d93a41d1ca3bfc03d889966df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F02 16060 bytes

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