Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe1ce91bb01d079…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 09:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a8244b3e360a58db4bb813bf2f6e8082 SHA-1: f20668d11859524befaa6bead5148f388d48d5d2 SHA-256: afe1ce91bb01d079a47da8030a56c62f96a1f167b7d4a0a23508d11116ed4a29
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, exhibiting malformed stream lengths indicative of exploit activity. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. The PDF's structure and embedded links align with common tactics for spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pixomot.ru/uplcv?utm_term=mohsin+khan+quran+translation+pdf PDF link annotation
    • http://omgmediatank.com/userfiles/files/wuzizumutomojikemorezogi.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/61786209492.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/lokixaritefiwino.pdfIn PDF document text
    • http://355353.ru/userfiles/file/56879515630.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87442b6de---23955423501.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/19132163758.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/xatoritazidapedodo.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/fonarupinuv.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/tupaxik.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/12284414594.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/33888313125.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/11390888503.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/99275377259.pdfIn PDF document text
    • http://cartopack.be/Images/file/wawanuxon.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/67847338973.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/44623743726.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/05165c0bbecb23207999c634776a59cb/subesowotuwowu.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/71599844991.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/195365859.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zavuxu.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/85233905925.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/zibapo.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910043850420020.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/zexufe.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_off0000b2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F2 15704 bytes
SHA-256: d56eb42d98f7078f1134c7487889301b360ebb03fc83ba76cccdf3009d2b7b04
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 10796 bytes
SHA-256: f871b7894aeaf670ccdd3f5ac5f71e89cba51a9ed3934ebbf926a89ce1851c87