Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b8d9746538a0ef…

MALICIOUS

PDF

80.5 KB Created: 2021-09-22 13:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2baa8e4e8a02562d513da4b1f3377f86 SHA-1: c9bb025dfd750ab16ac060cf44037a610f3a3924 SHA-256: 44b8d9746538a0efdb80cc2df90a264a88a9aa5731923efac5cda6df5b16fc9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farm and phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site or download further payloads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the use of link farms on disposable hosting, supporting the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b47953eefab2b32770ada34ada4bdca4/55687115674.pdf In PDF document text
    • https://navoloki.mebel18.com/uploads/files/nitufefo.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/46898870066.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/23456165464.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/6323803509.pdfIn PDF document text
    • http://swhos.com/upload/files/wudidifugawem.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/63269762778.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/fakizulemaf.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/xovosanuri.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/korivefarigaboviduxumele.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631090707.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/78300259558.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/81742274782.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/21224015020.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pezutilaxofenaxewudatif.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/38843726355.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/dexilupisiwizugelazojulo.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/64474395393.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/bedunuximoxezasuj.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/figojizur.pdfIn PDF document text
    • http://tajilin.com/upload/files/82015621838.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/85195069878.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/86523451872.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/tosofizikuvebuwajidas.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/xikotitamijalidijipexalis.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/47358245821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=two+and+a+half+men+full+episodes+freePDF 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_off0000d38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38D 18140 bytes
SHA-256: fd52b2f2d13636735b7dfc20513285277a667a21b7fc8a1afdfbb7f8958e0ca2
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10816 bytes
SHA-256: 5d986718bdc514cecebb43dd4b3e4e4c6bce5ef13bd1f00cdaefc6bc902326c5
font_02_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1