Malicious PDF — malware analysis report

Static analysis result for SHA-256 597216448396e2f0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 05:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af0efb041bc13fce33e79c80250f47d0 SHA-1: b04c23a9067d9a2e0e8a397b0a604c4fa35b9611 SHA-256: 597216448396e2f0c80d4d91f7635b5e3fa9d57b6bc54395424ff3670d235a34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm hosted on disposable domains, suggesting an attempt to obscure the true destination or host multiple malicious files. The presence of embedded URLs and the 'SEO Disposable Link Farm' heuristic indicate a deliberate effort to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://commune-bourre.com/userfiles/file/24823076696.pdf In PDF document text
    • http://startmatbaa.com/userfiles/file/69378827595.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/lezobe.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///delid.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/16071276631.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/vukuluxe.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109161758259300.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u700livk1fdsnmfol0p5as1mm0/68846497143.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/senuz.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/11/72154738554.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/64349119380.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/lufew.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/zutamenuwe.pdfIn PDF document text
    • http://erex.hu/upload/file/89602415868.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa86a1bed---19388318733.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/wudoferevesabojotijubed.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/sodofejimoketit.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/witusevarubal.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/78816590014.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/jisaguv.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/faraxipifepimoxejufex.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/25574150506.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/50846317472.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/69478659163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=forgot+my+android+pinPDF 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_off0000e086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 18484 bytes
SHA-256: 840ad23bdfe7743a92cd3d0956237f0d6fb1753893d35cd839c74ad2d3da30af
font_02_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 10480 bytes
SHA-256: e919e2bd60b3c41e6f4749014878e231f5e898d7a230b1040dcc59a79d39b941