Malicious PDF — malware analysis report

Static analysis result for SHA-256 9adac85ffdaa17ce…

MALICIOUS

PDF

69.8 KB Created: 2021-09-09 14:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 971c5abd92114b5ebcb1ebafd3bb2d3e SHA-1: f972306b228cf8987ba969fc8b03ff72d6ed7e9c SHA-256: 9adac85ffdaa17ce490a2c3a342b96996b9785ec382c8e08337ac460a54dc32a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://gcsiva.com/files/userfiles/file/42996832957.pdf In PDF document text
    • http://patp1ryb.ru/media/file/38176990263.pdfIn PDF document text
    • https://fond.ru/userfiles/file/jetinuwig.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/sidikozirerotekafub.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/rugekubemekoroguzizefi.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/bajalozidutopuwog.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/wopati.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/42947100727.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/58750276908.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109030334142048.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/mavuvivixudafutatetojipo.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/28594525135.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/6197022763.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/pafota.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/22512977008.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/38801002511.pdfIn PDF document text
    • http://atlas-consulting.ro/fckeditor/fisiere/file/kesuwuganewobuza.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/xatilodovukusevomotukasa.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/jaratumerew.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/84130879511.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/48780290890.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210902101105.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/11640016006.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109060431257822.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///xafifotuzavog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+pokemon+go+coins+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 10724 bytes
SHA-256: 5aa8e89ee6341f14456b7e5903cb1fedc932ec527fb207d46c39f9c9b7a170e4
font_02_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 14228 bytes
SHA-256: 9f2e56121378ec2374ca62ef50a18dd86f03f5392517a94a9617dd26edc79e6a

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