Malicious PDF — malware analysis report

Static analysis result for SHA-256 57baed1b103f724c…

MALICIOUS

PDF

94.8 KB Created: 2021-09-10 15:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fa59cb7be6d8c3eac5163008507fd46e SHA-1: 1ee2500ccfb820d09d01f89c4725e3e65983d692 SHA-256: 57baed1b103f724c0d84b6f6ce1a84a5eda85d2c9a0e95bb230410b3720c8ded
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, indicating a link farm designed to distribute malicious content. The presence of external URIs and the overall structure suggest an attempt to lure users into downloading further payloads, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=instagram+android+live PDF link annotation
    • http://fecirturizm.com/resimler/files/febawemilalarawov.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/towujinusavokavinonik.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/35306228140.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/dezasejirireti.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/95717074006.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/28527450896.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/bulanidibemusolaxopexu.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/63229787104.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/63997725776.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/diruvewiwudogililuvogi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/5680808142.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906184622539041.pdfIn PDF document text
    • https://maymac.info/userfiles/file/14037556845.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/mobojonelukapukuvolowu.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/luloregagifup.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vidugemu.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/posajinunat.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/wikotomatovosubiruk.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/3989019323.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210906163096567380.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/88220243715.pdfIn PDF document text
    • 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_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 22252 bytes
SHA-256: 4c578bcd5808efbd7cf40d8d2aaf16f4bba9cf24908a68a77b3d5c26029e2c89
font_01_sfnt_off00013dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E1 10608 bytes
SHA-256: df20359e2176a06cc85ecdc15b876f4b3b015077112462e609d5b1a5d899891b

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