Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddbe53fcf6248b2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 23:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 828ae2b78b4354748dee557450d466d9 SHA-1: c850ba96ff8f6fa8a4c63ced954f4104b219e75e SHA-256: 8ddbe53fcf6248b244a6fb64ada688201110c5c6f2ac54d4aa50a0b410d3fbf1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many of which are unknown or lead to PDF files, suggests this PDF is designed to exploit vulnerabilities or lure users into downloading further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this is part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://123podkrovie.sk/editor_uploads/files/23941113486.pdf In PDF document text
    • https://dom4m.de/userfiles/files/kibifiwiwol.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/wozepizasimiwuxad.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210902_FAFFCF7972BBC261.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/34388794831.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/11199783445.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/35083105083.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///20533664579.pdfIn PDF document text
    • https://virker-ikke.dk/files/40615440906.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/tevopefufewuguja.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d35eb80197---tirexokefewetulo.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/rerejezemajofipero.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/mazizagalegalami.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109191249489492.pdfIn PDF document text
    • http://talesma.com/E/file/26675094173.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/20933084854.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/42651116947.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417504632c6---24253676691.pdfIn PDF document text
    • http://agro-partner.com/Image/files/20908884312.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/46359341350.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/25744577663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=green+eggs+and+ham+game+onlinePDF 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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 17808 bytes
SHA-256: e73ae33db67e1de3bf95bece43a9811e34d2e3733a7c55b63629aa701729e0cb
font_02_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 10636 bytes
SHA-256: 8b5c4a659f00ac870498cc031e47b89f5c08d1d9dd250112728437d651d6831f

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