Malicious PDF — malware analysis report

Static analysis result for SHA-256 2527fb59efca4138…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 03:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 261b85fc887fb121e2663358c20a65c5 SHA-1: d638639fa7592738aaaf2780b3620e49868966a1 SHA-256: 2527fb59efca4138684a0652f935180467f27ae7b3185fb772eae4ab7838197e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the presence of external URIs and a link farm, suggesting the document is designed to redirect users to potentially harmful content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document employs a deceptive call-to-action to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://peterdegendt.be/file/zexigawajitelomo.pdf In PDF document text
    • http://shippingengineering.com/files/ckeditorothers/24353993336.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/lujeboka.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/fetosuwenemojoxemoweluta.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/91813971289.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/fezoz.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/41114549331.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210903062619.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/17604007689.pdfIn PDF document text
    • https://izr.fr/files/davezaneloloximamoxa.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/31085446160.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/68112724188.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/nanesowigozorule.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/sudofuboxut.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/jelorasajalarusibazoxi.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/1274164505.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/30693286606.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613629b83f7a2---bamewurijixege.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/xejasemofaketav.pdfIn PDF document text
    • http://nensi.si/upload/file/tofadowi.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/duvelesavumalel.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/47286168111.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/53879440069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ig+views+premium+apk+downloadPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/fedirojafew.pdfIn PDF document text
    • 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_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 18504 bytes
SHA-256: 86af3b8fb5430f7489cbe2df2b9b39d08c4749f163fc7c75fc5055cc15e10f38
font_02_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 10932 bytes
SHA-256: b200d2924f4337e54759190f566cd72aa5ba2d98cbaf4b71014748fcce4fc30e