Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0da74264f22530b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 11:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f76730ac3f6bf27ece01ed5eb06801a SHA-1: 421eb9636029387cdffbc0c517b3cef0be774c00 SHA-256: a0da74264f22530b1b9824beb2e13abe6641f852475e9867c133b50ef0b1e2d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also includes numerous external URIs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tuanlongland.com/upload/files/vazowafepiparu.pdf
    • http://gu-bo.cn/uploads/files/190059308.pdf
    • http://ekhoron21.mn/uploads/files/zewoxupamozijaz.pdf
    • https://comtraining.cl/userfiles/files/57254031576.pdf
    • http://poslovniimenik.net/firme_data/files/36119567569.pdf
    • http://abhinavabhishad.org/userfiles/file/futalowetarokezupate.pdf
    • http://bwlpsalisbury.com/uploads/files/57862953011.pdf
    • http://wefocusdesign.com/upload/files/namifaxamaxo.pdf
    • https://www.esfa.bg/root/ckfinder/userfiles/files/48134792429.pdf
    • http://dylogistics.com/userData/board/file/jekededajinawelevizefo.pdf
    • http://saigondome.com/uploads/userfiles/file/wuxasupewowo.pdf
    • http://zzquansu.cn/d/files/zuzezokutak.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/73217744431.pdf
    • http://t-eamplus.de/web/editor/files/bajusepafoxawuwupolebitow.pdf
    • http://elitakhealing.com/ckfinder/userfiles/files/batoz.pdf
    • http://studiophotosfashion.it/userfiles/files/77038355464.pdf
    • https://dentalrud.com/userfiles/file/20788524265.pdf
    • http://bugskin.org/userfiles/file/83025046498.pdf
    • https://cpc-serbia.org/js/files/junorovefizof.pdf
    • https://voxel-avocats.fr/uploads/file/
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fuwevufakawelu.pdf
    • https://rajnnuhiddje.se/userfiles/file/3019005347.pdf
    • https://derey.nl/app/webroot/files/userfiles/files/29986564771.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=after+series+book+2+pdf
    • 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_off0000ade1.bin
31869be832aaa6c1fc6acfa105fe2bfe5eaaa8ae52950ec28a4dd7e4c3884e13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE1 15500 bytes
font_01_sfnt_off0000d554.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 16792 bytes
font_02_sfnt_off0000ed6b.bin
05e294ad38ce1c7966e744cfc20c97086b407cdd1914e791b09a457dcec694e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 10512 bytes

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