Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3697bc0eb419e7f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 02:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddd18dff493f5bb36b9a399e023e8de6 SHA-1: 61219d54f977e2fc70838491e17291b4c5321606 SHA-256: b3697bc0eb419e7f86ecf64be5884a1749973940897246148343fc38295c0e4a
134 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links to PDF files hosted on various domains, coupled with a heuristic identifying it as a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://solarhomepage.ch/fckeditor/editor/images/file/monikiridunada.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144ad8d18ced---22787045874.pdfIn PDF document text
    • http://szwygs.com/upload/wokidi.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/49885401773.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zibilipizijabaduv.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161396f1d33299---jadoxupidajenatixidak.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907062205.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210913184839.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/zadoredivat.pdfIn PDF document text
    • http://iphysiology.ru/upload/kekide.pdfIn PDF document text
    • http://bjjiffy.com/upload/dabajokizinipukinodeke.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/75526230105.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kewexorobi.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/83211664417.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/lewuwogovipuzekoma.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/98888987124.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/85789138026.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/4685089872.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/39155891750.pdfIn PDF document text
    • http://parfumland.sk/upl/40584450993.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/35093489522.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/femokozifem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=netboom+play+pc+games+mod+apkPDF 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_off0000cf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 10884 bytes
SHA-256: 70cbfee3599e6311482e240094d499936b2df013193f8b4949164d469322cf8d
font_02_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 17660 bytes
SHA-256: 6532a2278ac60728977f0070cabb9530b281443dd140e7495be6d7768a2e95fb