Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49934bcd47ab8f1…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 01:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 565f61b5996904cef74d6ba6917aea63 SHA-1: e32357b679945e7c6e13f909dabb777087ab5634 SHA-256: a49934bcd47ab8f14098abd6500a0e3fca2d9229be38cb5ea262928999d9982b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=apa+itu+scan+barcode
    • http://eros-arena-reutlingen.de/eros/userfiles/file/tuwozev.pdf
    • http://pdww.ru/ckfinder/userfiles/files/vonivasu.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/38806919425.pdf
    • https://gazeta-msp.pl/user_files/File/domapevebuxozunox.pdf
    • http://1day2night.com/UserFiles/file/17402797926.pdf
    • http://tdbakademi.org/userfiles/files/32587812067.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210925_022036.pdf
    • http://surtek.biz/image/files/20150408_024958.pdf
    • http://surmounttravel.com/userfiles/files/ligurususamalujujekib.pdf
    • https://isuzuphonoi.com/data/dulieu/files/60382037849.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dd4506a7f3e05061d7e91daa6a53d739/53221583817.pdf
    • http://elai.kz/upload/2021/09files/210903135406103208pibsb.pdf
    • http://kunjipsc.com/uploads/files/90423328293.pdf
    • http://radyoislam.com/resimler/files/zurimak.pdf
    • http://maksimetall.ru/files/kogawupudolomiwode.pdf
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/64775633843.pdf
    • http://dtjxbpzx.com/filespath/files/20210908032927.pdf
    • https://myagenda.myagenda.cz/pictures/editor/files/56200810074.pdf
    • https://jeevadhara.org/work/london/userfiles/file/56703488206.pdf
    • https://073741256.com/uploads/files/202109202333095102.pdf
    • https://stpm-sa.com/userfiles/file/94422434245.pdf
    • https://szallas-karpatalja.com/upload/losopovoxe.pdf
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/46750860830.pdf
    • http://sunway.me/uploads/file/10115259349.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_off0000b1fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FC 16792 bytes
font_01_sfnt_off0000ca0e.bin
00a7dd5d57ec86cefc4fa2111f1287730480f83f8172d228d96db9be3d15312b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 18032 bytes
font_02_sfnt_off0000f875.bin
2cfa7651beec3b38f1c427ad9c812c7ed3d12328ebf081cef67de0b036b3be40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 10684 bytes

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