Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f15e3f935e11f3…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 02:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3d0a0aaeadc0ea320ae919216471da1 SHA-1: 6abe481aca6636cf43835f9beb6c926f7db85c12 SHA-256: 60f15e3f935e11f3d4c9f57f92fdedfd9e1ac5a7b606cdf7dbc1edcc32d75594
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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 http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db29e5d604---kametejat.pdf In PDF document text
    • http://parfumerieindex.nl/images/uploads/39232182277.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/36830888844.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/lowujusixulejo.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/vudutaranixezisiza.pdfIn PDF document text
    • http://intertribo.sk/files/68608032146.pdfIn PDF document text
    • http://kodemari.info/data/files/ziziwoboliwune.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109041055419157.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/83874850466.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/20632243190.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/favapujinavazodiwoj.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/65909381514.pdfIn PDF document text
    • http://w-mill.jp/images/file/kanufobupenuledajikivi.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/nininubamoreris.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/96817757707.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/45812870958.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/13371643360.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/widudufunu.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/vevunomojes.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/salimenudumatasulamuzux.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/14157432424.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/runubusozavofog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hack+app+data+apk+no+rootPDF 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_off0000baee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD305 10152 bytes
SHA-256: c02ade70fbf38c8832e7d828333f1528f0cbf0f5ee56a8a32f803415428c2a47
font_02_sfnt_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 16332 bytes
SHA-256: dff48d0238fa0adfe5fb65528ab460d26aa631775a6d5a4c1578ba2f44d790e6

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