Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9171d9404ae71a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 18:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 680747931f0fa61f7242e29a3be036e9 SHA-1: 62a21c3988256e879996caafd7718f79790d5def SHA-256: bc9171d9404ae71a78ec030c4e6447b57a9e9f01a1aa288689bfcf9af5e208bb
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. The presence of many unknown URLs further supports this, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://senarathgroup.lk/assets/media/file/57748938896.pdf In PDF document text
    • http://sooam.com/files/fckeditor/file/213727121961386e1403943.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/47881319376.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/dewopubagulopunonowu.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/90913389851.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/dusupakatijabowukidowi.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/9288285977.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/minunezuwusowumosevufe.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/kepogeketot.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/tanipetalugefulufi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134d2c49ceeb---32838371399.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/vufelutegekoxonulazo.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/14077289732.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/vipifaninulipedixasasu.pdfIn PDF document text
    • https://krossi.ru/images/content/files/xobusupugodigo.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/nepijakipugoxexin.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/48540459124.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/xamak.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/40034159968.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/46344464858.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/64042821953.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/gigesawanedajag.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/zezimowovogixil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+install+apk+on+amazon+fire+stickPDF 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_off0000c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 10868 bytes
SHA-256: 74506db2d0e6fa33ca2c212e0a977139837757a678179a7d949285ecb5805516
font_01_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 17172 bytes
SHA-256: 1115ee882ba453e987ba920f48a06590c1278b9d272b5bafe09c60e39c20d993
font_02_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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