Malicious PDF — malware analysis report

Static analysis result for SHA-256 42bfde7f22df5aad…

MALICIOUS

PDF

66.8 KB Created: 2021-02-21 17:21:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7352cff9338dc76bf43bd2454c5a88ce SHA-1: 5fcc61d3a2f272f71f1cc5ff5ebe9e6907ceff1d SHA-256: 42bfde7f22df5aad121d34bc144572bd73285de1e81c4e992c31b9b3de84c33a
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, suggests a lure related to downloading a 'medical terminology' PDF, which is a common phishing pretext. The presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=medical+terminology+a+short+course+pdf+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_5fc65abadadcf.pdfIn PDF document text
    • https://xibagepop.weebly.com/uploads/1/3/1/4/131438114/2656359.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/49d1761f.pdfIn PDF document text
    • http://adyga.site/bas_bajna_chahiye_gaana_videovey40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5ff1d5a45f772.pdfIn PDF document text
    • http://distornyup.site/mimovuvobizogemoozdix.pdfIn PDF document text
    • https://piwaxokireruber.weebly.com/uploads/1/3/0/9/130969414/967f8b.pdfIn PDF document text
    • https://zomogazafef.weebly.com/uploads/1/3/5/3/135348967/rakudagajej-jigop.pdfIn PDF document text
    • http://foyou.store/canales_ecuatorianos_en_vivo_apkzhjzf.pdfIn PDF document text
    • http://arnautmebel.ru/79708088719ze9lf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5ff0328bf385e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_600503e87bb1e.pdfIn PDF document text
    • http://vizimuvorogo.22web.org/buminax.pdfIn PDF document text
    • http://thesimplycompleteseries.com/dutijekilezuvudomifolxchln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://badetez.epizy.com/jagutuvelim.pdfIn PDF document text
    • http://takamuwemevofe.epizy.com/utorrent_android_remote_access.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/spider_man_ps4_pc_game_free.pdfIn PDF document text
    • http://xiditad.rf.gd/football_manager_handler_2015_transfer_update_2019.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_off0000c6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B0 5768 bytes
SHA-256: 5d087f0e131d20c55e6ed51cd96a0b2976f06c3b9135eefb6d5bfc4277383d8a
font_01_sfnt_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 10456 bytes
SHA-256: d2c4a8acf6e1211bf34ced392271a2ac18967878dd2e59ed9e8d11cac2aa69ff

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