Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0dcc1b34fb61728…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 16:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a33ce43d4964e6331d641a017b989eb SHA-1: 2ba2b9ac748579032522bfd3cc53b1d735ba0af8 SHA-256: a0dcc1b34fb617289f76707930ea926fafb2339f94cc8a1318e61268ebd05427
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to potentially compromised or malicious domains, suggests the document is designed to redirect users to harmful content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a pattern of using disposable hosting for link farms, a common tactic in phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://rajakeempat.com/contents/files/82370235164.pdf In PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/gapogopazurufadisupi.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tibanefunosenozeni.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/zuxatitawuwuvaxudegubatax.pdfIn PDF document text
    • https://isleo.com/i_photos/file/95554027262.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/rolebawo.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/26174718694.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/83368417756.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/doxalululubujov.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/kugolulijenoxanopujafisuf.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/xetatisanasowi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/73325599007.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/16471277310.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/20762975356.pdfIn PDF document text
    • https://emenu.hu/editor_up/99090918011.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/senoziporevos.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/91824758386.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/27317638882.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379da657c63---39497272988.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/63647300219.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/xojasipejadapavex.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/1233092664.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/xivubur.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/74558145185.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6344aa3c---lulomumubabisu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/32025846799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=robin+bird+box+plans+pdfPDF 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_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 10548 bytes
SHA-256: c0d122511a7c6fbb7b1f0f5e45cb4769fd3f953c2dec9d3f8560dcffa20cd35f
font_01_sfnt_off0000fc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC94 17068 bytes
SHA-256: 9cfe755a9a2ad8aa8a0589ba55bb83b2065942754d7ca18bd9f523dd90848bce
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1