Malicious PDF — malware analysis report

Static analysis result for SHA-256 916f774de7857f6d…

MALICIOUS

PDF

75.8 KB Created: 2022-06-17 02:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 9bc73d06c0070370362b6f2f32f719f0 SHA-1: 1c8a8a6be0d7ca589f4ec70b211b6031804da83a SHA-256: 916f774de7857f6db502d0ab4ea21194438e515f8c6c3a4e91740fe7ca97e60b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO spam tactic. One prominent external URI, 'https://loheb.co.za/YmrXLWy8?keyword=brandt%20daroff%20exercises%20pdf%20spanish%20to%20english%20converter', indicates a lure for users searching for specific document types. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://loheb.co.za/YmrXLWy8?keyword=brandt%20daroff%20exercises%20pdf%20spanish%20to%20english%20converter
    • https://zipilevodito.weebly.com/uploads/1/4/1/8/141893648/poxaki.pdf
    • https://ziwarojuwetupo.weebly.com/uploads/1/3/4/3/134343479/9519018.pdf
    • https://megogira.weebly.com/uploads/1/3/4/5/134590171/jaxosuramufebara.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1620636a69fcbf---vafawik.pdf
    • https://fuwexizadosilu.weebly.com/uploads/1/3/5/3/135318643/defere_dinov_deruxabegasomin_wofevukopagupo.pdf
    • https://doxibizogo.weebly.com/uploads/1/3/4/8/134893922/d33366b2ed22a3c.pdf
    • https://xubekiginulivuj.weebly.com/uploads/1/4/2/0/142053197/8637033.pdf
    • https://jubuxazule.weebly.com/uploads/1/3/4/5/134585976/navunebefugek.pdf
    • https://momuxubodi.weebly.com/uploads/1/3/1/3/131379397/gojevub-zugovukirififiw.pdf
    • http://landvest-usa.com/file_space/files/tuxerazose.pdf
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/dimufikaxipizujidi.pdf
    • https://xepolilibud.weebly.com/uploads/1/3/4/5/134591261/4aa97cc.pdf
    • https://wowutelugige.weebly.com/uploads/1/3/4/3/134359508/bumevuguvufazakafu.pdf
    • https://nonuradijo.weebly.com/uploads/1/3/1/4/131406562/c8289b0a9.pdf
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/a1edd8754a.pdf
    • https://zitododu.weebly.com/uploads/1/4/1/5/141506946/ddb98a163ff.pdf
    • https://wodiwige.weebly.com/uploads/1/3/5/3/135317556/lugizo.pdf
    • https://gosabejeda.weebly.com/uploads/1/3/1/4/131453015/71e3a28bda4da64.pdf
    • https://gaturipagi.weebly.com/uploads/1/3/0/7/130739573/f2cc409e.pdf
    • http://amtautotrasporti.com/ckeditor/kcfinder/upload/files/86864889620.pdf
    • http://whipitleather.com/userfiles/file/befafadudoboxow.pdf
    • http://aolisenjiancai.com/data/files/nipeliminigoderemiguwox.pdf
    • https://rekoprint.cz/files/ckfiles/file/45333817497.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_off0000bf08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 16792 bytes
font_01_sfnt_off0000d71a.bin
0bf36948598a3aeab614d177c8f9823df3f31243b8e2f01c9afb7d8d3b471290		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 18372 bytes
font_02_sfnt_off000106c6.bin
779bce5b89c6f5ea77ae64ee51f0d3496299de14914742d0ee01aa31bb2b45dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 11120 bytes

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