Malicious PDF — malware analysis report

Static analysis result for SHA-256 445026f4bc42a831…

MALICIOUS

PDF

74.4 KB Created: 2021-09-11 01:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fa2ff78fb2517239f3f1a679ab65451 SHA-1: 7d2b7e2dcb30adc854d5d2c91ca5aa4edb413396 SHA-256: 445026f4bc42a831325bf791be217b1e133640530f61d244c2b6c3b7fe47338c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to suspicious domains and are likely part of a link farm designed to redirect users to malicious content. The presence of external URIs and the ML classification strongly suggest an attempt to lure users to external sites for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://egokituz.eus/files/galeria/files/rezozajakojexupusa.pdf In PDF document text
    • https://tyko.pl/userfiles/file/jilebitozakaxirajebagovi.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/54065944904.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/zaxipoto.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2be5404e2---51044861970.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/76710204598.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/bopapovi.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/94396005459.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/50587396138.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/zegafi.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210901_060955.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/fesejew.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/85550713641.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/sowek.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/95517674810.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/34849036096.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/wefew.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/kawepakebi.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xateleponas.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/42887966200.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/37434712512.pdfIn PDF document text
    • http://snft.ro/media/file/papojojadiwokejesi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/cc318cdc55746f797e7a0f004c0c6200/nexavibipofes.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/fazepidulojadofaxezil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=uu+booster+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_off0000bcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBB 18588 bytes
SHA-256: 40e17c5724bd6abadd02731082db64bcd1e9446d155a4651a59fb2bc5e6ba606
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 10480 bytes
SHA-256: 19fd48d5b5dbf1fd165f02eff24293b2d0841f3bde9ce270c39c9056a571aead