Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c626f97c6eac25…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 04:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 88c5180c1e0adc9892740c9b8bceafb0 SHA-1: a11cf0e0bb4ff9686f1015c0470f6234bfdd6577 SHA-256: b8c626f97c6eac251731b1559535e86833433e488349acf80c6a6e46e8a6133b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with one prominent URL suggesting a firmware update lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

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 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.
  • 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://soxebez.ru/123?utm_term=unifi+uap-+ac-+lr+firmware PDF link annotation
    • http://jajuviramigawo.medianewsonline.com/rijutu.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/25262187232.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/aprendizajes_clave_primaria_quinto_grado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_e47ef355c5604a2ea8ee1359827ab633.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_b221721e44cf4b76aecc488f0411109f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/how_to_answer_questions_under_cross_examination.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/75613462849.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/41139312468.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_ff2c5ba42ccc4efc895276cabdcc5f61.pdf?index=trueIn PDF document text
    • http://xenexafa.myartsonline.com/20866165432.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/64211643122.pdfIn PDF document text
    • http://nizexududitew.epizy.com/witewojibixetu.pdfIn PDF document text
    • http://wulekugigewipo.epizy.com/25632568136.pdfIn PDF document text
    • http://duzunop.rf.gd/simple_past_and_present_perfect_practice.pdfIn PDF document text
    • http://pareruwawetis.rf.gd/20246212055.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/manij.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/pajokodejazes.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_2eacd10c5d1749b2a4069467ca993d64.pdf?index=trueIn PDF document text
    • http://manosotidokef.myartsonline.com/behringer_xenyx_q802usb_manuale_italiano.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_e1435638ecb74e01ba1ffcca4b7648a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/75965172810.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_e228bf88bf0c458aa346bd072b5c371d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 5096 bytes
SHA-256: 6d466c89e06c2f15b2ae252e4e1ad2006796feaccc568dfc8696984f4a25c5ec
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 13292 bytes
SHA-256: 59b268dd0f665fc7bc273403008f916bcff93b759f808100915fae6d98619873

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