Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8567581ade68ba9…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 18:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40fd63560d40a3ef1bc097bda4a88e6f SHA-1: 21ad18be35af989544d560e137e952f1be575111 SHA-256: b8567581ade68ba90f87be193860674bf24efeed2afa4fa085261cc49687588a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's part of a larger scheme to distribute malicious content or manipulate search engine results. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://rhondachem.com/d/files/marixoregopomo.pdf In PDF document text
    • http://yoron.net/up/files/88499217804.pdfIn PDF document text
    • https://halead.com/uploadfile/1631022957.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/gisagep.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/59931377882.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/waselovusefobojagefajevaj.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/98334046467.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/66630654582.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/3747270483.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151273120afe---19342378390.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/raxigeporaputun.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/pibugijomorutapobumizoso.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9056cf403---berazulafizomezusun.pdfIn PDF document text
    • http://africahistory.net/africahistory/upload/files/45668259138.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/17060667955.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/dinidufexatimujalivow.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/39633764342.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/25037571038.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210904/file/bikadewunezabadobakosu.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/karaxuz.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/60693794666.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/98152957608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=steal+like+an+artist+journal+pdf+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_off0000adfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 10888 bytes
SHA-256: 6aeaadb7f2a914a8d71efdc1afc58d9a92f73d8c33d4ee5f2983214d2ee4c0a9
font_02_sfnt_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 16384 bytes
SHA-256: 0159f0998f3f3607f677b0ddb291bfaeb5d98d5a40ea22b7bf4331316703eeef

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