Malicious PDF — malware analysis report

Static analysis result for SHA-256 e97dd6294f287b40…

MALICIOUS

PDF

82.7 KB Created: 2021-02-24 08:42:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6fce6f41b5741765fb36a45f8bdd6585 SHA-1: 888c242104d9c1820b52dc031ab7924076b2990d SHA-256: e97dd6294f287b407eb2814300d9a11e39795d8e1f5ba705ee0d439efb7885cb
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/strik'. The ML classifier also strongly indicated maliciousness. While the document body is heavily obfuscated and unreadable, the presence of a malicious URL is a strong indicator of an attempt to lure the user to a harmful site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 3

  • 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.
  • 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/strik?utm_term=what+explains+the+molecular+structure+of+water In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_601f290fae9b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475854/normal_602ebc6182013.pdfIn PDF document text
    • http://discovljzg.fun/53205113855t5i45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5fdff8ac90151.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475196/normal_5fddc7fc38830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369914/normal_5ff808c3cfd8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474450/normal_6008aba98c649.pdfIn PDF document text
    • http://burovaboxesomu.iblogger.org/bcg_full_form_in_marathi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_5fdc63b54a991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_60053c1235aed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_602ebbf1e59b5.pdfIn PDF document text
    • http://macsk.space/87366393765bqzwo.pdfIn PDF document text
    • http://probnik1313.tech/89822333911uq882.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494440/normal_5fe2163b8cac5.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
    • http://fokodema.epizy.com/igcse_ict_study_and_revision_guide.pdfIn PDF document text
    • http://wafovon.epizy.com/properties_and_reactions_of_hydrocarbons_lab_report.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/7857003183.pdfIn PDF document text
    • http://tosaxope.rf.gd/how_to_answer_medical_ethics_interview_questions.pdfIn PDF document text
    • http://nexuvojof.epizy.com/cheung_kong_property_holdings_limited_annual_report.pdfIn PDF document text
    • http://puwukuju.epizy.com/55650763877.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 5312 bytes
SHA-256: 2a92c159eebf12388482f37b8091d62bcd5487f15cf506fe10873ad24468cc78
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 10872 bytes
SHA-256: 4bccb98cc7501ba000910c7381bb1dbc8fa09380a6a3c591fe736652828d730f
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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