Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edb7bb498482dfe…

MALICIOUS

PDF

80.1 KB Created: 2021-02-24 22:58:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bb4af4fd9f6f59744dcb919daef0dabc SHA-1: dc123b91c045549a287aafa865d87670a8036a92 SHA-256: 4edb7bb498482dfe59f0454150eba296363199931f79d3cf0825a5d5b2ff2c15
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wix?keyword=polarity+of+isopropyl+alcohol In PDF document text
    • http://winoxolupuvil.getenjoyment.net/xawobakobowiwopiwo.pdfIn PDF document text
    • http://jivusibofonefud.mygamesonline.org/84878338953.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/hjjehbR/mobile_payments_today_editorial_calendar.pdfIn PDF document text
    • http://redita.fun/900927875182up4w.pdfIn PDF document text
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/b1e4761030ba90f.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/cUjhbUm/best_lawn_cutting_robot.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/schlage_keypad_deadbolt_home_depot.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/does_the_watchmen_movie_follow_the_comics.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/Jgejbqu/ink_bendy_coloring_pictures.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/gakufuzojitililokimeni.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/43182798063.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/68909234920.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/25098627368.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/bezapej-gexula.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/papipe_jowuziwojiz_tanorekad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/tonumimijonimorejazetejan.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/28523435589.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_off0000f368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 5204 bytes
SHA-256: 6d114284ae6afd53f73cad56ad70fe56ece0dbd0baf864b33c2ce0f5edffc5a4
font_01_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 14724 bytes
SHA-256: fc9a455725884fd5a33e3221a6ebe09601c539c440184fa632877783191ab1b9

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