Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b63ca323609330…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 01:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 311e1fddbd25162e7f55af3ee13e2e38 SHA-1: 2bfb41d3ddd0bae03063fb9ac1cedc2c0ea1d0cc SHA-256: 06b63ca323609330337c20b7d351f8d311ad6a5141c947a1a2b2151c31bbcf62
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous external URIs pointing to disposable domains, indicative of a link farm designed to host malicious content. Heuristics indicate a deceptive download button and ML classification strongly suggests malicious intent. ClamAV detection confirms this, identifying it as Pdf.Phishing.Trojan. The presence of embedded JavaScript, though not fully analyzed, likely facilitates the download of a second-stage payload, aligning with common phishing and trojan delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://pixomot.ru/uplcv?utm_term=bios+android+ps2
    • http://heorungminhphat.com/luutru/files/valeka.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/sedawamewupovuze.pdf
    • http://safiorida.dk/operatori/userfiles/file/93404519020.pdf
    • https://self-storage.sg/images/uploadedimages/file/46372997744.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/pifubukoxiz.pdf
    • https://sanvexe.vn/webroot/img/files/gowikaseposesukikegule.pdf
    • http://tythb.com/uploadfile/files/91235478623.pdf
    • http://hoaisonland.vn/upload/files/xorixoben.pdf
    • http://svenskafik.se/uploads/fckeditor/file/xikurejuto.pdf
    • http://hyundainhapkhau.net/upload/files/52780995133.pdf
    • http://coimbrasoftware.hu/images/uploads/files/97175530105.pdf
    • http://www.nena-artspace.com/ckfinder/userfiles/files/gumutagukat.pdf
    • http://alrabbancapital.com/file/files/18551257101.pdf
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/dodak.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d439b136ac8b660d7c1065cd0ca78d5e/95101733511.pdf
    • http://kiiga.ru/userfiles/file/78608015107.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kavux.pdf
    • http://putzlappenborner.at/editor_up/keladuruvu.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/2697092282.pdf
    • http://jsushibrea.com/uploads/files/41834756395.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/pta9nrsajgucq1lbjr7ssa3ru8/megetukafafe.pdf
    • http://vngo-cc.vn/cooker/public/files/mugodofozudu.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/demojojim.pdf
    • https://aneri12.eu/res/file/93655915279.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/xuzitexikisuz.pdf
    • https://nyirfa.hu/uploads/files/gejor.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_off0000c9a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 16792 bytes
font_01_sfnt_off0000e1b7.bin
6359bdefaa39ad9d4180e42ddc2a7f69c116d664e481173ab21942632b208b6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 17824 bytes
font_02_sfnt_off00010fb2.bin
0c666b995ab1006a49f90bd7b8f27098cdca229104aed1b5bb8e8aa42f5eb592
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 10284 bytes