Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0fe91f71ef1cfb…

MALICIOUS

PDF

78.9 KB Created: 2021-05-23 13:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9f5b3b3da838f53d2b4040281775eec5 SHA-1: 51573d9b988c0e439f3729fcac783ba5c59be3bc SHA-256: 6f0fe91f71ef1cfb2ab8b34508ab001ccca393d237e7b123e96967a72ca44e11
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm for SEO manipulation. Although no scripts were extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/strik?utm_term=old+bengali+movie+download+site+name In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_600c9ce65165e.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/fomoxabujelawarare.pdfIn PDF document text
    • https://jaxurawutedoma.weebly.com/uploads/1/3/0/7/130739660/6294015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_600a5f41ecac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6045badedc91c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481402/normal_5fdbedae526ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454277/normal_6014922cab7a9.pdfIn PDF document text
    • https://pexikonafan.weebly.com/uploads/1/3/4/3/134351575/robonex.pdfIn PDF document text
    • https://bubamixidik.weebly.com/uploads/1/3/4/6/134657394/7d953ecc0f02f6.pdfIn PDF document text
    • https://bepirujeli.weebly.com/uploads/1/3/1/8/131856565/vapomolodov.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/lorujume_tefevobesomuda_xemeresut_gamazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_601d08c646c42.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/sikuva/91199246647.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/31802789786.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/cape_cod_traffic_report_bourne_bridge.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/jandy_aquapure_service_code_123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d7ac0d-ebd2-419b-9d0f-7d940622b5dd/78521913165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7e341d-0920-4836-933e-e7e3463c2433/23053502161.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/bakekukuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cf4f95-69d9-4228-b379-736a97eecc9c/free_printable_printable_man_in_the_arena_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6ad742-d94f-44de-803a-477fce9e8c80/pawuj.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_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 5368 bytes
SHA-256: 761d1d6de9cca611e3c0fe31e5523f5dbc9dc583966dcce9e47aa0f1b67a8f7e
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 11000 bytes
SHA-256: 250cb8431460fedb20d4ae582d418fd55c5546d286378e2268ecd029748876c0

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