Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffd082a180014c2…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 04:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1f77d45196d52b3e32596a8df7b9669 SHA-1: 350fe25e12fd9a7b83b74c4bc9ab913b28138e4d SHA-256: 7ffd082a180014c2c450349fddbed9be6f7f6d78192d5476e35715d3793e9de5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://accessiblevehicleservices.com/userfiles/file/kitinuzemorizigadiruka.pdf In PDF document text
    • https://paulogomeslda.com/userfiles/file/50173216953.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/78618917372.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/xozowoton.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72354722027.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/25376280444.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/wazabemebodozazonofadivup.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/3078172144.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/79155301758.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/10654831142.pdfIn PDF document text
    • http://scantech3d.com/files/15267834059.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/74886860805.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d43977727a9baeb1d3a5da8047e77742.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/ratoniwa.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/bumopesasatezukugon.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79257205278.pdfIn PDF document text
    • https://mfdesign.hu/files/file/viserobiruna.pdfIn PDF document text
    • http://anpo.vn/upload/files/nivubomajelafa.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210914071656.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/27061253535.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/49753513991.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/xexasijaniponavupowopa.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/pisuzemomofalusepozo.pdfIn PDF document text
    • https://alariel.be/userfiles/file/vefuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=prime+video+full+hd+androidPDF 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_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0C 16664 bytes
SHA-256: abf3a3709f4983fc55194cbd4a516c0f532e1d1d3380a7cf2726c91cc0668634
font_02_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 10520 bytes
SHA-256: bbc916953bd8143639b6194f053a875dd32d5fda2c2884665facb37e0c814825

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