Malicious PDF — malware analysis report

Static analysis result for SHA-256 19681c67aed1d1ec…

MALICIOUS

PDF

77.5 KB Created: 2021-08-16 16:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: f22e24eb649fae27cd998de6b41880c3 SHA-1: 29fae02dcc685036adb33cf94d08f1babb1e9ba9 SHA-256: 19681c67aed1d1ec95f1e4c422f48cfc2dd167667a02d946e7b0de1039de1908
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 0.9998

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://hijaulumut.com/contents//files/48584272809.pdf In PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/95746555900.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/38864744652.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/19682801791.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/likoxelaja.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lemivefamowudufibafu.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/lomix.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/43662143281.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/64959950415.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/17479958689.pdfIn PDF document text
    • http://vucert.vn/uploads/files/wuvalogenelidimomiwisoxe.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/xobasipinobiz.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/70291895248.pdfIn PDF document text
    • https://bio86.net/fichiers/gevorofegime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+write+a+thank+you+letter+to+a+board+of+directorsPDF 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_off0000ccbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBE 11096 bytes
SHA-256: f3226d7cbe0b343135cc560197e533624cf007455c7286caed3c531c183ba7da
font_01_sfnt_off0000e691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 16020 bytes
SHA-256: 0698ad2c4de6051eff4423847267ac72929187e39d9a807b31f85b0717a8dbf8
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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