Malicious PDF — malware analysis report

Static analysis result for SHA-256 c445caaf7c4e1520…

MALICIOUS

PDF

95.2 KB Created: 2021-03-22 16:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7451409a21a0a9464ccec964f98575f4 SHA-1: cdefadfa17eb2ae631bd7f238443c34fdb6b914c SHA-256: c445caaf7c4e1520c68b93bcf4ce7591d402f02a240d9e3f87dc76f0b70dd0cd
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The PDF also functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of malicious links indicates a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://yafferge.ru/wix?keyword=m416+trailer+specs In PDF document text
    • https://cdn.sqhk.co/zoxunoromi/3gcigjd/acca_examiner_report_f6.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/yAijUhd/mr_bowman_secret_life.pdfIn PDF document text
    • https://cdn.sqhk.co/zajagatetode/ifDqSxX/pofugezelanagil.pdfIn PDF document text
    • http://mowuvivof.22web.org/gagevutab.pdfIn PDF document text
    • http://sawelob.22web.org/nopureduxanoja.pdfIn PDF document text
    • http://nudevego.iblogger.org/buxajokeduwatunanuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/hcfbiax/pirate_king_mod_apk_free_download.pdfIn PDF document text
    • http://sidawiw.iblogger.org/confluence_technical_documentation_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/buganabowumujef/98470973347.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/22911270704.pdfIn PDF document text
    • http://juzefabamurever.rf.gd/lisaregozabujamesifojiz.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_14e28b9afc8741d3836a8d2037862335.pdf?index=trueIn PDF document text
    • http://pidosowot.epizy.com/fezav.pdfIn PDF document text
    • http://pekinomigaw.epizy.com/simple_restaurant_business_plan_template.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_eafb2198e6ce4f04a07e69061f9da1ab.pdf?index=trueIn PDF document text
    • http://bemeridalazobox.epizy.com/electronic_devices_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/agenda_templates_word.pdfIn PDF document text
    • http://vigopul.epizy.com/discovery_channel_asia_program_guide.pdfIn PDF document text
    • http://xafamikipu.epizy.com/best_astronomy_app_android.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_7ecbd26f58fa41b98ee19bcc29b21b4f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 4796 bytes
SHA-256: 6bba7d4340c97d88f0a8f6587d466e13da12df55cde626a508b4d4695a5e64a1
font_01_sfnt_off0001383b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383B 12048 bytes
SHA-256: d650ee1372b3b9d1c8c4e199c281c85aee8ffebc9531e54513663413de9d8f6d
font_02_sfnt_off0001613d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1613D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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