Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc336a309a710dde…

MALICIOUS

PDF

80.9 KB Created: 2021-10-14 06:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 13842178c4712c4d5166b0bb97b3a290 SHA-1: 2280d2f8f02ef981be8ed1bc6fbdd6d723acc9d4 SHA-256: fc336a309a710dded7591d7aec5817022ae1ffde0006f5c0e2173b7e2f327df4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier, indicating malicious intent. Heuristics indicate the PDF contains multiple embedded links and visual lures designed to trick users into downloading further malicious content, consistent with a phishing campaign. The presence of a QR code lure and download button suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://capitaloffice.pl/fotki/file/zekevu.pdf In PDF document text
    • http://stringladies.cz/userfiles/dimazipilebo.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/firijisomutukafavi.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/muronu.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/nuberib.pdfIn PDF document text
    • https://kapefashion.com/files/files/61259825201.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/74875925276.pdfIn PDF document text
    • http://staropolski.net/Upload/file/41171538644.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/wukizolukunugodapazim.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cc80f1376b---lupofugulirupoga.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/jajofofenivatobupesurom.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/40493473717.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/sujusak.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/16031232266.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/duwakefolitawufita.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/rotazujik.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/66812522343.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/susitumaxarovetuwivud.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/82825467750.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/mexudewonidinetijute.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/uamoi65thejlev2i2f80h4d43b/zofefepe.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/21001100229.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/44561776297.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tazuxur.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lonapaxikokes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=bt+dialer+for+smartwatch+free+downloadPDF 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_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 18740 bytes
SHA-256: 0043b737b6e7b5067f8b1c644eb6ec9aa751f8f9bca049daaaa3b3a44653d37e
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 10880 bytes
SHA-256: 14b07cbd76cc9d4edc0c46e5f47692643cbe5f61608819aa41916ecd1baae21c