Malicious PDF — malware analysis report

Static analysis result for SHA-256 c481822a2907d03f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-25 05:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7d1e722d177ee202d08450a951ef270 SHA-1: 6ded879cd0502e6d957ce4a639f941c4823a2c48 SHA-256: c481822a2907d03fcda33070e3c86237146f9f08dd0df11349c5b91c503b925a
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sciattella.net/images/file/39506366012.pdf
    • https://drlalashow.com/php/billboard/uploads/file/71408022690.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/29527846703.pdf
    • https://mobspace.xyz/web/img/podborky/files/verekimuzikodif.pdf
    • https://www.natursany.com/ckfinder/userfiles/files/91687754932.pdf
    • http://hissekurban.com/resimler/files/varozak.pdf
    • http://mmsmarin.com/imgimage/file/19680925820.pdf
    • http://absolutelyneon.com/userfiles/file/kidategebuki.pdf
    • https://gonguyenkhoi.vn/upload/files/96338345141.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133376869141---31674446918.pdf
    • https://datatech-int.com/userfiles/file/81697860940.pdf
    • https://villadelauca.com/userfiles/file/kuvanowuzarimasedefolewo.pdf
    • http://tjsyjdq.com/v15/Upload/file/2021910537449150.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/81596284777.pdf
    • http://decorstore.eu/upload/file/kazizap.pdf
    • http://artio.pl/files/files/sutukujumarigofadirafomo.pdf
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/46033146906.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210902_62A0C8F1B94804C1.pdf
    • http://bualuang101.com/backoffice/upload/files/jawujej.pdf
    • http://thietkewebbacninh.com/webroot/img/files/79583631392.pdf
    • http://primethailand.com/ckfinder/userfiles/files/lasezifofum.pdf
    • https://tolgyesvolgy.hu/userfiles/file/83654598323.pdf
    • https://onutglen.com/caningest/images/file/jidexok.pdf
    • http://fsf-vastroad.com/userfiles/file/23338214822.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kasowanie+danych+android
    • 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_off0000e0f9.bin
f93057f1045268c53e3e09eb2001a2fdcf4a678a027ef9660b77b8cfb226dfd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 10512 bytes
font_01_sfnt_off0000f8e9.bin
11da92ace61a63042f904a4431b1683be3c600010a26be179b210a6ed01f806f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 17908 bytes
font_02_sfnt_off000125e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 16792 bytes

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