Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d9e03f34264781…

MALICIOUS

PDF

68.7 KB Created: 2021-09-17 16:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d2ebe6293d9ec78227f22d5975f85c9 SHA-1: 6962cb61f294c0764ebe04fb75a571a05700bbbf SHA-256: c8d9e03f34264781ca09a23d7fcb25c8cba01182a379f1182fff1bdf6655462a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded clickable actions pointing to external URLs. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the heuristics suggest the primary goal is to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://chukguwang.com/files/fckeditor/file/fojupokefumolupevobiwoxar.pdf In PDF document text
    • http://abwingssuffolk1.com/uploads/files/lemalavidaporogikakuvifi.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/pafemuramit.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/78453366135.pdfIn PDF document text
    • http://kme-kme.cz/files/file/rovapedunu.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210917_32E0FEFB0F648903.pdfIn PDF document text
    • https://denimder.org/resimler/files/nubakozopavoto.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/milojamivavusono.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/zemivivizuz.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lesavaxebefulutoturo.pdfIn PDF document text
    • https://la-klamm.org/Files/files/68316293880.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/23102734902.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/29971654003.pdfIn PDF document text
    • http://orlickachata.cz/files/files/gefaxapemujatuk.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/xegutarubisajogujedaras.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/sapitofadomamafudumax.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/38542737672.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109080803542866.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/darajumanakat.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210905_025D96611DF75EA4.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910001940848275.pdfIn PDF document text
    • http://horvathortho.hu/tmp/28230838164.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jokido.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/xodikoforala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=past+simple+and+past+continuous+reading+comprehension+pdfPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/21972162875.pdfIn PDF document text
    • 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_off0000b05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC870 14148 bytes
SHA-256: a22d09740cbe6696e75282c2067ba11704fc1c42a5af9eca5a82e49e2a9f34b9
font_02_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 11168 bytes
SHA-256: fb6cb4055acfe0f04e000e16ae6b1eef41351a83743032627793783c47007a1d