Malicious PDF — malware analysis report

Static analysis result for SHA-256 feffad752dbae268…

MALICIOUS

PDF

76.0 KB Created: 2021-02-17 16:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eadfa85a90ac3994916dfe72610f9799 SHA-1: 6eae8569bcc1a8f4315278dace3298d4298b7f67 SHA-256: feffad752dbae268ada4d9191053d4b8ead361575b9873483a7939d1ee170d1c
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URLs, such as 'https://crophysi.ru/strik?utm_term=cu%2528h2o%25296+2%252B+structure', indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates redirection.

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/strik?utm_term=cu%2528h2o%25296+2%252B+structure In PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/cd10e0cd81f.pdfIn PDF document text
    • https://lisewaduw.weebly.com/uploads/1/3/4/3/134358893/xavopelozud-domikulosupim-rewevosufazaves-somadowekanuwuf.pdfIn PDF document text
    • http://it50life.pro/division_word_problems_worksheets_grade_4hsrkj.pdfIn PDF document text
    • http://price-list.moscow/vegetarian_indian_recipes_snacksxp28q.pdfIn PDF document text
    • https://gazodajatara.weebly.com/uploads/1/3/2/7/132712558/duxupusabozopuvaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427538/normal_5fe0870328873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372980/normal_5ff977836bbb0.pdfIn PDF document text
    • http://bupro.asia/870601767201hc2e.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/fajeloninesitel/foruxirixikaf.pdfIn PDF document text
    • http://tupanukaxigazit.epizy.com/81693823823.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/casanova_hotel_apkpure.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_off0000db68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB68 4836 bytes
SHA-256: a90a31ce08e2b2423a951d3d5708592c0054835c0e6df4a781326f88d20b5b2d
font_01_sfnt_off0000ec04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 12300 bytes
SHA-256: 33db6faa00f10297fe2e4adc9114db6a29cdc604f82a86a791860f59f29ec24f
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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