Malicious PDF — malware analysis report

Static analysis result for SHA-256 07044e0faea42de5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 00:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3569ae4bc1a71b7a91d728ef83619f9b SHA-1: 85e17fd273dfa82e55b455f62a1294ec4e4048b0 SHA-256: 07044e0faea42de5680f7213f4b294c15b1b3b78809d155d393217b21b20325d
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for numerous links. The primary attack pattern appears to be luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.multilandtours.com/assets/ckfinder/userfiles/files/madajotes.pdf In PDF document text
    • https://tmtteks.com/files/79057653100.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/tisane.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/xefoduline.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/bixazitusi.pdfIn PDF document text
    • http://askaudit.ru/price/31402364325.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a86b762c7---nifefuwuruzojikesamuse.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/mebisetezewopujetuxi.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/mulel.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/pigiwuruxaxefenexeromepi.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/dirutiviwepikejiwi.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613940597f244---90437506358.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/pejigewobogipaxawerawite.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/88878585371.pdfIn PDF document text
    • http://dezis.ru/uploads/files/luxirux.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/72644654166.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/guzenes.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/wifevutumab.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/84910569623.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/safibebufosuzuz.pdfIn PDF document text
    • http://linza-market.ru/upload/files/navunumanowof.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/49931657619.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/naweduforisonepapakotu.pdfIn PDF document text
    • https://digireg.es/upload/30072422799.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/93615318797.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/xexizodagijamezitigik.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/lilopof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+ble+heart+rate+monitor+source+codePDF 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_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 10856 bytes
SHA-256: 0aeb8dde2fb282d669301e8413b88c98edcd1d84586e9564d782568ab35e8462
font_02_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 18084 bytes
SHA-256: 9bef248a124f1895ddbcbc018cb42df693b29b951a81ab35e26b600226207a07