Malicious PDF — malware analysis report

Static analysis result for SHA-256 b013b598d2465a6c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 00:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 415b50b1946fe713415c3c583505c490 SHA-1: c8180ce24c95d59e82f38049161109bd88ff4dac SHA-256: b013b598d2465a6c80cd522ac8687d072d16300981db0183bd8a65914972de40
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of malicious activity, including malformed streams and a high ML classifier score. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure indicate an effort to redirect the user to external content, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://immodraft.nrw/images/architekten_agentur_images_/file/buwomimagodutuwasebebiru.pdf In PDF document text
    • http://tech-in.info/bramy/userfiles/file/pizewinajitidanof.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/83151747352.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/58239694699.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16314131344851.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/75692278692.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/rakaregobazolizer.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/masukalafefo.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/13145095967.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f5fe725371ea04885e714816950f1bf0/31696563777.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/paxizelisupazexasularisaz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8fcec77d6---41434397372.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/bedukamudurekaguj.pdfIn PDF document text
    • https://invest.pl/userfiles/file/benedepuli.pdfIn PDF document text
    • http://asqcert.net/files/files/27436646256.pdfIn PDF document text
    • https://klaipeda.cvzona.lt/resources/img/files/tovedoxokekofanagitazaw.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/57669018999.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/webanudenu.pdfIn PDF document text
    • https://people11people.gr/uploads/File/41047160618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fast+furious+4+onlinePDF 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_off0000cd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 10360 bytes
SHA-256: d52dd2ef96d1232ad63708c51a19e1279b29380440f45846a975e52cc96ed596
font_02_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 16680 bytes
SHA-256: 84ffa644a88a440b440979a85626e48a8925c332f1f44ebb0fb6191c87b976b7

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