Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afa3e1eac621a0b…

MALICIOUS

PDF

81.6 KB Created: 2021-03-01 19:29:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d4f080797819c8fb77706d2d0d57fa62 SHA-1: a57131786f82ac2bbf586f90a38ec6b436eb5244 SHA-256: 4afa3e1eac621a0b01d31de508f550fd7ecc0d8ae6e00a24c35ccf5134cd89c6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic specifically flags it as a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via the linked sites. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users.

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 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://ponafet.ru/award?keyword=toshiba+ct-90325+tv+manual PDF link annotation
    • http://vaxisezawoged.scienceontheweb.net/98566332167.pdfIn PDF document text
    • http://puxeguka.iblogger.org/baba_yetu_score.pdfIn PDF document text
    • http://kebosukav.22web.org/padumigorunoduninej.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/mhbz7ic/tasafonesiwufijejurato.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/html_css_javascript_project_software_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529697/normal_5ff078c34274d.pdfIn PDF document text
    • http://kuziluzesoga.22web.org/gagilen.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/tg3Oiag/17203596856.pdfIn PDF document text
    • http://lesoxagepisubaw.iblogger.org/the_captive_lady_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/iecijWK/play_ruzzle_free_online.pdfIn PDF document text
    • http://penerete.66ghz.com/browsec_vpn_chrome_extension.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/do_casio_keyboards_have_weighted_keys.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapudajikipidem.epizy.com/16816705117.pdfIn PDF document text
    • http://duvodix.myartsonline.com/gokip.pdfIn PDF document text
    • http://xunevonobi.epizy.com/thumbs_up_meme_template.pdfIn PDF document text
    • http://purotowuzogivu.rf.gd/vuwaxinif.pdfIn PDF document text
    • http://fokoxowikelejex.rf.gd/didaxaxaxobepimizuluxa.pdfIn PDF document text
    • http://jevotafax.rf.gd/2000_honda_rancher_350_es_foot_shifter.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_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 5844 bytes
SHA-256: 1eefb7f6697ba93a96f1f17b3105bb0dee5f65622cdca545634d868053f297c5
font_01_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 10652 bytes
SHA-256: 6e4a227649610b13ef3116648ae2aa35543d50cee6d85f0c440ea4ac356ed8a5

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