Malicious PDF — malware analysis report

Static analysis result for SHA-256 b543f33415fc83e7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 04:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14cea192e52d44d15f759b83ffae450d SHA-1: 1e4bcf565213ae4bea9bcf88393ef0b9c6965876 SHA-256: b543f33415fc83e7ac41a87844e4795902decba683e97ca95e255f4d234e6c83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of the 'utm_term=android+update+info+app' parameter in one URL strongly indicates a lure related to app updates. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://oniceh.ru/uplcv?utm_term=android+update+info+app PDF link annotation
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/mafomasoxosepera.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/73547676652.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/97488355496.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/91623441512.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/49473379025.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/vinazodulitetowipoju.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/77256333725.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/81302373134.pdfIn PDF document text
    • https://network-italia.com/file/94794022778.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/76123743490.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7d09e21b---kekelikig.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0b03d4c6563c3fa73d2bdaac55e8cbe6/45849571248.pdfIn PDF document text
    • https://bacsionline.net/userfiles/file/kabegekoperu.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/purav.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/javabifege.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109011338404679.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf68549c4---97502754734.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/mefotiropakinewabogu.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/14965765348.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/47947967305.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/kinewonijuwoma.pdfIn PDF document text
    • http://congtyvima.com/images/Download/sadunalus.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/libisubaboduzenovolune.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 10360 bytes
SHA-256: 5879d8d27140f49a69ade810c86c5c4e912bb0f5eb71ec77f91feb468620ab5b
font_01_sfnt_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 17932 bytes
SHA-256: a44778441d6619cf675f0e91c88968f018eb67dd79ef7fde14c3b67a4056cf3c
font_02_sfnt_off0001237b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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