Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1f2711804932d6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 16:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: e68c90aad197d0b9a5b1a96a8397f741 SHA-1: d1de9db224283d3a6ebcfb198ce64533185ea848 SHA-256: ac1f2711804932d65049f4df6e59f7d99b163a60dc51fea30869fadb3984f9dc
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 0.9992

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://jimsclub.net/new/board/img_tinfo/file/20210903191110.pdf In PDF document text
    • http://z500.si/files/59306691588.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/50026748047.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/dukuwepolagab.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/50413460097.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/wemelopirawajazuze.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/68970200501.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/33797184386.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/18198033622.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/buvabon.pdfIn PDF document text
    • https://rajaunited.com/contents/files/sikazedowezapon.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/torisexoxogojowewoniji.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/mibep.pdfIn PDF document text
    • http://boxethai38.com/upload/file/watemafo.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gojusepawoxafosegugalivef.pdfIn PDF document text
    • http://builderall.info/userfiles/file/26161293222.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/30399583059.pdfIn PDF document text
    • http://ahchala.com/img/file/xiragojozix.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/86787479957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=timbangan+beras+manualPDF 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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 10436 bytes
SHA-256: b0058a8af8a0a1235d1ec9d5e6731020ef7899d428a6889e983fa19b848fb788
font_01_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 16828 bytes
SHA-256: c5c0fe35973093c41082744cfed5c48a1a5838239f2aaf0199f161fd556d93e3

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