Malicious PDF — malware analysis report

Static analysis result for SHA-256 e993d836735dd850…

MALICIOUS

PDF

76.3 KB Created: 2021-03-25 04:10:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4c75c6e784e74569c3df702164d50c64 SHA-1: 1d19de9e16bb488f7afbe761a5c1252b1ca095cd SHA-256: e993d836735dd850152fcd0978fc2efe42bc8fdf23336acef409b1427c897da8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The document body, though partially corrupted, suggests a lure related to medical treatment, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/award?keyword=hernia+de+disco+cervical+tratamiento+pdf PDF link annotation
    • https://cdn.sqhk.co/nobutowug/lhfLhfx/99821017123.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/kazasefajutib-gomebo.pdfIn PDF document text
    • http://sirekijugodo.22web.org/ritolifafed.pdfIn PDF document text
    • https://ziluxofizavamo.weebly.com/uploads/1/3/6/0/136009732/rinaxivun_jorodu.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/9988800.pdfIn PDF document text
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/wifoxusix.pdfIn PDF document text
    • http://detodefinedex.22web.org/microsoft_dynamics_365_guides.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/zutejovub.pdfIn PDF document text
    • http://dewiwusuxutez.iblogger.org/24585752518.pdfIn PDF document text
    • https://bewizujire.weebly.com/uploads/1/3/2/3/132303264/a841d03f8c006.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/hFySafu/bandicam_free_download_crack.pdfIn PDF document text
    • https://vitafidazi.weebly.com/uploads/1/3/4/7/134728623/zamategugefusux-fugenabogolev-gikibed-rutalomexik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopamebedozupux.epizy.com/befugamafosizajovi.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/berlin_i_love_you_movie.pdfIn PDF document text
    • http://vibotiguxux.rf.gd/dell_optiplex_755_processor_socket.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/xazodojudoveg.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/97346691602.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/pimexa.pdfIn PDF document text
    • http://xofududegotu.epizy.com/xulufutofufezazisune.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 5324 bytes
SHA-256: 963b72c1e1e8f7e9adf15e32a8a5ece758c9b722792187e8cfabe28b07a5fd9f
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 11728 bytes
SHA-256: d51a8e875ecc4759cd4ab6d7c7751cce4f9638368745213f383760a4137a8fcb

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