Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d56d88ee753add…

MALICIOUS

PDF

82.8 KB Created: 2022-05-27 05:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 18c6879de66a511a2f9a3148d2b1cda0 SHA-1: 1de1a921d7ac7032d6a6cf588e1995130fd3a8cf SHA-256: f5d56d88ee753addc5af7e25ef77cfa6acb347df404fe239cfe5e8cfb646d785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm for SEO manipulation. One prominent URL, https://lazav.co.za/YmrXLWy8?keyword=intermediate%20algebra%2012th%20edition%20pdf%20download%202017%20pdf%20free%20torrent, is presented as a direct link. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lazav.co.za/YmrXLWy8?keyword=intermediate%20algebra%2012th%20edition%20pdf%20download%202017%20pdf%20free%20torrent
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/6764930.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/aa65b6f43bdca98ccb9ca445b0f2a1b3/mojewatewa.pdf
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/5727549.pdf
    • http://mictrogiang.com/userfiles/files/71025646984.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/gowomujivalose.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/162080e9b14afa---74493324765.pdf
    • http://tuclubcr.com/campannas/file/gojumejivuwuwizov.pdf
    • https://drjou-vc.com/upload/files/50680866744.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16243a007eaf2e---dixopaxisutero.pdf
    • https://pimetukuke.weebly.com/uploads/1/3/4/0/134017259/viratilidixi.pdf
    • http://blog-lunettes.top-lunettes.com/userfiles/file/64784631664.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/rubufevebetezuwubex.pdf
    • http://7serve.org/userfiles/file/20220416004320.pdf
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/97c11df540b88.pdf
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/174697.pdf
    • https://zojobowexiwe.weebly.com/uploads/1/3/1/3/131380894/senunodesiwepu_pabebama.pdf
    • http://azizolace.cz/images/file/feraxadosexofilegupenes.pdf
    • https://bikasiju.weebly.com/uploads/1/3/4/3/134385723/0737a789ed483cf.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/68d392350b44aa57b7402b517eb9c850/20991429691.pdf
    • https://laptopserwis.com/app/webroot/media/files/52690195270.pdf
    • http://khungbangkhengiare.com/media/ftp/file/5543857415.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/98553544229.pdf
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/perajenuza.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb3.bin
0dcce11b980b0cd406efffbef80f98493c389e5217fef713017101ac4fc9f6a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 17312 bytes
font_01_sfnt_off000109b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 16792 bytes
font_02_sfnt_off000121cc.bin
b20d2ef97b5c18078c63d6bc3e8f62e83e09f32f5a906daebd4a8bbdca05f8cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 11296 bytes