Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bff9da0eb200f5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 17:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ef2837851830f6e665194a2442318b6 SHA-1: 81981e67b78a1999990bfeba0dde4c8a58f65028 SHA-256: e8bff9da0eb200f5375f381c6cbf4df6bfc7774fbe24220fc0b6007d2e784339
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to other PDF files hosted on various domains. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ingatlanfelugyelet.hu/uploads/file/10762500292.pdf In PDF document text
    • http://packamate.com/userfiles/21320057044.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3f5fd22666f7b2199ba343ba54d2ea8e/3009319498.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/59992130086.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd77ab212e---64724812606.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/xefomoka.pdfIn PDF document text
    • http://ge-mak.com/files/24840865522.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/zeretowadot.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/31378436402.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/wowewos.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090708173325.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/dolekusogejikaganiv.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/zopiboj.pdfIn PDF document text
    • https://jurad.eu/files/file/4160395579.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/jiliwobuwaloxami.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/sulute.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/luvanukokev.pdfIn PDF document text
    • http://btfa.tw/upload/files/46389265421.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/10246948920.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/58524886622.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/sapudutajoluzawafugok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ds+emu+for+androidPDF 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_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 10472 bytes
SHA-256: e5decaf66d3669964d953fc1b87765a064e59f6aca2fe69b0ebde91802841ff5
font_01_sfnt_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 17836 bytes
SHA-256: de7aafc6f7d3123d4ab85d1b1146d54bf1602be7e36bb6fe76021a9f72dd1677
font_02_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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