Malicious PDF — malware analysis report

Static analysis result for SHA-256 f115258596f8b8f8…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 11:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85b01282fb798500c44997c67300d5f5 SHA-1: 7459a739f32319ce04f73f3f961cbf87b4c8f2ab SHA-256: f115258596f8b8f888c705e6ab9906d4272e41b06b926ad1239fb06e5614808a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, distributing numerous links across many distinct, potentially disposable domains. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://iglozawiercie.pl/zdjecia/file/warajoze.pdf In PDF document text
    • https://helicopterleasingservices.com/userfiles/files/71523326522.pdfIn PDF document text
    • http://emannsltd.com/userfiles/liridowumazuzogujarolib.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/tomeramarimikomib.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/16746659976.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/gikiwefotejujeranawa.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/maxowelebenubobi.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/47693290748.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/6250526923.pdfIn PDF document text
    • https://linardi.ru/files/file/93257877050.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/wozizeluzexopipifibinuma.pdfIn PDF document text
    • http://elsped.hu/files/file/67752454953.pdfIn PDF document text
    • https://e-midas.ro/files/file/83895213808.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbfd3b99a5---17867075674.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/31298914385.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/906927867.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/vuluxafupenetimobupajud.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/62207782662.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/veledubifogitugela.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/38583636249.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nukaxovexowu.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/90038628805.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140143d00124---sododitifunodalirozogejo.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87559687336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+sdk+path+in+android+studioPDF 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_off0000da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA27 10896 bytes
SHA-256: c4ce48563cd355bd8361e9f8aa64fa1d1886c987ebb20eef336d650e2fab9921
font_01_sfnt_off0000f32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 17872 bytes
SHA-256: 36245237a7acbe63ad69a7bd8886aaf8d8fc15b29fca8cf5b44bc5de6bfbc1e3
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1