Malicious PDF — malware analysis report

Static analysis result for SHA-256 5919f6da5d540a68…

MALICIOUS

PDF

81.2 KB Created: 2021-04-29 01:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7da580982ee135aa40ebf9b92b2fbe0e SHA-1: 9440c7f8b883564043d2b892ea0974bb49ec908f SHA-256: 5919f6da5d540a68ca783d20ca623ff8d0dbbc4bf18f70297c393ed774e618bb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL leading to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though partially corrupted, indicates a lure related to leadership quotes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://midufefew.ru/strik?utm_term=difference+between+leader+and+boss+quote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415334/normal_6046345188b2d.pdfIn PDF document text
    • http://albatros-trans.ru/the_five_tibetan_rites_poster58gl2.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/xanugemozodezus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_6031294852f51.pdfIn PDF document text
    • http://unosital.space/dujixewapagifgx2lo.pdfIn PDF document text
    • http://mojikinewosak.22web.org/hobart_handler_190_parts.pdfIn PDF document text
    • http://bowenaf.22web.org/big_data_analysis_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_604b02be2befa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455208/normal_606ab8647a742.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazomo/ledefijisidapepamotuli.pdfIn PDF document text
    • http://kabekanofaxo.epizy.com/31863810619.pdfIn PDF document text
    • http://jamenajiko.myartsonline.com/big_data_python_tutorial.pdfIn PDF document text
    • http://zerujafulo.rf.gd/noledavib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d03ef17-b6e6-4270-90f6-a561c435e173/46798895562.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/90081076355.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/what_makes_you_a_successful_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87e2ac4-073e-40fc-9078-6faf6a8e3a5c/adobe_premiere_pro_cs6_software_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79e9b53b-2edf-41c0-85d7-5a574c51c090/toloruvutan.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/munutijupe.pdfIn PDF document text
    • http://zaxowudupa.rf.gd/trivia_geography_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df81324-69f6-44d0-8378-b289dc1d4c7e/84973024945.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_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 5372 bytes
SHA-256: 17f8d2a055686b36bbfb66a468c23dd5c800be62f31e971f50c1fa57ef56d80e
font_01_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 10808 bytes
SHA-256: 30e991264ddc44fb44d1b8b95f79f3d72ff3793893fb535e100596133534ba44

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