Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7442ceaa5508e7…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 01:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6e7503136c2443b21bdf2a5446d9948 SHA-1: 6959de9e27c063e16b7da73d015287f9e9b4e312 SHA-256: 5e7442ceaa5508e7f2de4c0ff8422bc2e127ca5f46663c705abfb7af4bedf18c
126 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 malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of embedded URLs suggest the document is designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to facilitate initial access via spearphishing.

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 https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/rizikogujasifenobifidanoj.pdf
    • https://aakritidigitals.com/userfiles/files/wizezuzur.pdf
    • http://easytravel63.ru/ckfinder/userfiles/files/49463981238.pdf
    • http://beveragesgs.com/userfiles/file/78006263076.pdf
    • http://juicy-group.com/editor_upload_image/file/xulefomutufoxotixig.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/mufuj.pdf
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95343460796.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/ponolamofozumofosuge.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/94865526548.pdf
    • http://www.sushmitamukherjee.com/fckimages/file/zajuvuxigog.pdf
    • http://iwayman.com/uploadfiles/file/210912215443173515b55mvw.pdf
    • https://fotoprint.lv/downloads/file/81954139602.pdf
    • https://sitarasign.ir/data/file/semoxudofi.pdf
    • http://tunesistudio.eu/userfiles/files/33637151497.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/29928527401.pdf
    • http://oasis-inwaste.asia/files/file/tesanamazunulij.pdf
    • http://hoaisonland.vn/upload/files/vodaxasinusetefefovibojo.pdf
    • https://jordan.si/dokumenti/file/tovakixuvaxakesovuvu.pdf
    • https://presstone.hu/userfiles/file/13902522152.pdf
    • http://kesherisrael.com/uploadEditor/files/tipizigijuzured.pdf
    • http://goldendazzle.com/upload/quangtri/files/vivaxoxoxu.pdf
    • https://sukienmiennam.com/userupload/files/tegulelezegekusametub.pdf
    • https://svenjakretschmer.com/ckfinder/userfiles/files/mufubudoxerefet.pdf
    • https://basisangka.com/contents/files/xuvujimi.pdf
    • http://kimandyoo.com/userfiles/file/28308982787.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=skyrim+barenziah+stones
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b41b.bin
3076c47ff8bde33c2cb1db0cbde9ada45ee0eabcf4c0ff08370360ea60d6c0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB41B 10808 bytes
font_01_sfnt_off0000cce7.bin
848fbedd2b002725591be0f45421db44e29a7a8c7688591bce873728d0e5b61f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 15332 bytes
font_02_sfnt_off0000f390.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 16792 bytes

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