Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55b8490e87ebf77…

MALICIOUS

PDF

85.8 KB Created: 2021-03-23 06:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: cc3bfde283f5df56e07b51c13bb28037 SHA-1: d74eaba76df2641776d1c4a4a9ecf5d85f3fab59 SHA-256: f55b8490e87ebf7788c7f6a9680a0f0fa41668b43241058d042a9acb23aa45ef
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or redirection attempt. It contains a large number of embedded links, many pointing to disposable hosting, designed to create a link farm. The primary malicious URL identified is https://dafemum.ru/award?keyword=aerospace+structural+analysis+pdf, which is likely used for redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/award?keyword=aerospace+structural+analysis+pdf In PDF document text
    • https://zepukuliro.weebly.com/uploads/1/3/5/9/135964459/pavasawukizufinu.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/8082360.pdfIn PDF document text
    • https://maninuwag.weebly.com/uploads/1/3/4/5/134577581/6316123.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/1161189214.pdfIn PDF document text
    • http://goxivomibivufuv.mywebcommunity.org/cch_ct.pdfIn PDF document text
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/5345580.pdfIn PDF document text
    • https://wijuluberaselak.weebly.com/uploads/1/3/4/0/134016921/gutovugefunoti.pdfIn PDF document text
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/8402100.pdfIn PDF document text
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/f31ef7ff722.pdfIn PDF document text
    • http://vutunema.mypressonline.com/vuwideremowon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopewexe.onlinewebshop.net/isometric_to_orthographic_drawing_exercises.pdfIn PDF document text
    • http://gojejamajutemus.epizy.com/excel_2013_bedingte_formatierung_wenn_formel.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/geralizevowosazabodiruf.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/how_long_is_harry_potter_5_movie.pdfIn PDF document text
    • http://kuzojif.rf.gd/bedazzler_instructions.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/the_expanse_season_5_episode_4_online.pdfIn PDF document text
    • http://bozizivaposenu.epizy.com/android_auto_toyota_highlander_2019.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/c_function_template_specialization_pointer_type.pdfIn PDF document text
    • http://wifofevowogak.onlinewebshop.net/74500598016.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_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 5240 bytes
SHA-256: 7ebc727368ce2531bea37b23482fde839c681c44d9ffa83e5edf88cc3565fa33
font_01_sfnt_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 11592 bytes
SHA-256: 8b773c409c560dcc714ed2e1774ffad7dcbb342d18390f4505e2a5ad7b413c5d

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