Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1571d898949e49d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 13:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 725a41437e14ec63663b356c0dafa790 SHA-1: e1b0dfa5873d856032bfb0defb9ef854fafb68f9 SHA-256: b1571d898949e49d16ffbf4ea658257deec7b55bfa628b19ca6aa56c55686007
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://awkontrakt.pl/ckfinder/userfiles/files/57793235554.pdf In PDF document text
    • https://zzwgjx.com/d/files/1203996576.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/vutotakunuvufo.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/nopitepobototaluko.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe88fc87a1---36892692189.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/kubigari.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/36530571028.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/zujipiwabovuge.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/wuwerajorumirogor.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/67837027953.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawiteza.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/fulul.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/zuvogagunabinafafedaki.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/44795585899.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/44916834475.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/moxumimopirigoluvuvuvuje.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/61188702710.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/18446610077.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/jeriwadefikokoxexafanivej.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/lanelajoxifabodivokobob.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/fokarezorevuwunibi.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/11746424293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mulan+1998+full+movie+in+englishPDF 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_off0000bbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF1 11048 bytes
SHA-256: e97f2bd873e6d331f49a23db8b11d0cdc4d92d5865989be5662379f2cbcef9bf
font_01_sfnt_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 18572 bytes
SHA-256: 0ebc804cd77785c0cc8f38b3210b0c3729cb429ca166e0943a5281bff12cacaa
font_02_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1