Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f7abc42c56a5d7…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 01:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2999d8d3a33aca147c692d6250f36de7 SHA-1: 489abf21e210df310e020dad561ad9c5632f05e8 SHA-256: f9f7abc42c56a5d7585a31e7d6172c65f8441b997e98b1e2f69f4f71f172a199
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a large number of links pointing to disposable hosting, suggesting a phishing or spam campaign. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the presence of many external links implies an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inwebjor.ru/uplcv?utm_term=dockerfile+build+env
    • http://lgassociates.in/uploads/99842192012.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/nakepigezozimusozajilafuz.pdf
    • https://photopoligrafic.ru/ckfinder/userfiles/files/sutowixuwafan.pdf
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/9580948765.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202109011404543641.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/22806447655.pdf
    • http://asv-solnice.cz/_files/file/52357580254.pdf
    • http://fskyok.com/uploadfile/files/ruwowedokemegidufawo.pdf
    • http://zjgjqmr.com/v15/Upload/file/2021912148587283.pdf
    • http://dglytbt.com/upfolder/e/files/20210909130954.pdf
    • http://atel-j.nl/uploads/files/2481362999.pdf
    • http://factblogs.com/uploaded_files/userfiles/files/53945978450.pdf
    • http://bpabv.nl/uploadfiles/file/39192091077.pdf
    • https://egyptsuntours.com/userfiles/files/72406465597.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/fetobutojiripomelotikov.pdf
    • http://ajitcoatings.com/uploads/wekarof.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/24852284390.pdf
    • http://ivankrivanek.com/userfiles/file/76913512019.pdf
    • http://think6.net/ckfinder/userfiles/files/20210902204400.pdf
    • http://tucholainfo.pl/userfiles/file/pagato.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/dividosopagekidogagos.pdf
    • http://problemconsulting.com/img/download/files/mebupemexonekudumezibad.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/gakunijiru.pdf
    • https://perfecthospitals.org/FCKeditor/file/lekesom.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614071d5b9c48---95210735437.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/tavuvebedataget.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_off0000c987.bin
9df850fd51a5fdfe67a5d4fbc7e798ba14ff66b1d16ee9a8564d61b78ec8e5ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC987 10440 bytes
font_01_sfnt_off0000e13f.bin
c80fe773acb579d74b15e252cfd97aecb1440222ed8db4cb0fbcdaec07ab4c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 17540 bytes
font_02_sfnt_off00010f23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 16792 bytes

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