Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4cceb387419a64…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 09:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7bc9585d5ba384e7eafc49c7172b6c82 SHA-1: 9cea1950a272b5fdc08952103698f37ea147e142 SHA-256: 4c4cceb387419a64fcad76b20a1a119f6d6bff91a66b9dfe524d38acda17247e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URIs, with one pointing to a raw IP address, indicating a potential attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://robedecreateur.com/img/files/97561370633.pdf In PDF document text
    • http://client.diffuse.info/files/22653754627.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/06/14510274913.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/pozegefu.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/24980734129.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20219554587878.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/sunokobedologiruvimul.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/gonixironin.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe455c1ae9---20938233654.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426b7f6513d---lanewafimito.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/besigaseromipuxabaji.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/bunejexanizetunujubaniki.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/53598984509.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/68492758899.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/96638702397.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/34480022859.pdfPDF link annotation
    • http://athaj2.specialty-match.com/upload/files/8308223061.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/61349318064.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/26766128931.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/89285569511.pdfIn PDF document text
    • http://belloverde.net/emailer/file/vuder.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210911_553FBF96432117F5.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/jirukajuf.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/54004587235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gazi+television+livePDF link annotation
    • 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_off0000b8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A2 17776 bytes
SHA-256: b4f26739e7fbe4ed00ef0e8da82de6b21b6e11f452ce35919d197eb94c5adc47
font_01_sfnt_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 10164 bytes
SHA-256: 311bb707131a435c95ee55b5b9b992c78a4ead8f0133545a952371ce6982132e