Malicious PDF — malware analysis report

Static analysis result for SHA-256 19e5978a18226e30…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 23:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3601a86ee81e49e2b0d1b065dbb6596 SHA-1: 969da086f9956e296413f6e1e3639eb0d66209bb SHA-256: 19e5978a18226e30917bfa128061ad64875d8449648fec1996aa6e009f6c6247
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple external URIs, with a notable one pointing directly to an IP address hosting another PDF file. This suggests a multi-stage attack where the initial PDF acts as a lure or dropper, directing the user to a secondary malicious document hosted on a potentially untrusted IP.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://140.121.180.103/ckfinder/userfiles/files/kufazovepiref.pdf PDF link annotation
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/fknk8oa4c0qp8mkmstd1etl0vl/losalasotajalujex.pdfIn PDF document text
    • http://praguetransfer.com/files/file/pepinorivafubejow.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/jawafipafoduvo.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/99913202246.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/wozivumupenareruzumu.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/50958320.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/89753634164.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/vevomireruk.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/51001478194.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/seluxigoteg.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/54162755730.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/75063025795.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zowefomexerobe.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/bosiketeguxezezerezavabu.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/venizaforemuduvotuvuw.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/tesijinuzemu.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/pidizazuvoxomerijatupipos.pdfIn PDF document text
    • http://davcpundri.com/css/file/38072739867.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/98134692461.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/45632361896.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210917055627404059kygk8.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/374b4ba5606d0d2cc561168e5101dc50/73826291055.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/bevulatotubuvazix.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/pezeperolani.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/lasusizefewivufudubiguve.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/39152517116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bridge+constructor+mod+apk+downloadPDF 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_off0000b283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB283 14300 bytes
SHA-256: 2dd642ff7dde2252840cd2a6100fd19542b2b40e4c4ad417f7558bce78940d79
font_01_sfnt_off0000d631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD631 11188 bytes
SHA-256: 561adccc7b349d82968563f682ebeae4511ec03f6362ff11b51319885a156ec9
font_02_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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