Malicious PDF — malware analysis report

Static analysis result for SHA-256 2725e137a6affcf1…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 13:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8120a26d3ddc9937f343a201007df1ee SHA-1: 81cff4a4ccb2f9065837a6addc4bce506459da65 SHA-256: 2725e137a6affcf125e5dba76f5a27999ec8ce7748dca49031378e6c418e0e3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is a link farm on disposable hosting. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://garglob.ru/uplcv?utm_term=magic+tree+house+4+pdf
    • http://mikailang.net/userfiles/file/20210908121407_93218929.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a056dcd02---nidewonak.pdf
    • http://fkjz.cn/upload/files/2021/09/202109071335162287.pdf
    • http://globalbando.com/DATA/upload/files/202109012257262856.pdf
    • http://puntolinea.org/userfiles/files/linefuwomus.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/katanuzobujopowobe.pdf
    • http://cn-noah.com/uploadfile/file/buruwenutonorefonaku.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115bf88fd3---28610300825.pdf
    • https://zerling.eu/nico/images/files/34130908611.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/tiwakutewogujufazo.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/65616318167.pdf
    • https://die-elke.de/cms/elke_page_files/file/52380948996.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/gukasaxozepexebogowa.pdf
    • http://christschoolblr.in/userfiles/file/tafegaxilisada.pdf
    • http://jungam21.com/upfiles/file/1631088684.pdf
    • https://lecachet.fr/docs/files/13344222518.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210905_679F7E582BF698CC.pdf
    • http://pcccphucvinh.com/upload/files/buveni.pdf
    • https://needletherapy.eu/upload/file/dogubesodovoter.pdf
    • http://avatars.ru/userfiles/file/pinitimedizemux.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/92677732122.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/884064026.pdf
    • https://clubelsendero.com/img_pag/file/wolasavibesuj.pdf
    • http://noithatmyhome.com/img/files/88132968931.pdf
    • http://factblogs.com/uploaded_files/userfiles/files/sejaluzoku.pdf
    • http://petrduchek.com/files/nugevimuxet.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_off0000deff.bin
31726bb154d806822565f264236ff3d644f9223094c26612a302376e7bac0153		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 19196 bytes
font_01_sfnt_off00011123.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11123 16792 bytes
font_02_sfnt_off0001293a.bin
4ce0ce59ac137557f7c91db21eb8a34fe52fc9eccc968476e2cf5a39edffc134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 10920 bytes

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