Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f2b645d33fb868…

MALICIOUS

PDF

87.6 KB Created: 2021-03-11 18:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b381dc738a926c7f155916627c6b30d9 SHA-1: 878428fda0c1a1780aec24452f6048a1601eb68f SHA-256: a1f2b645d33fb8687273cb74fb0e95fdf383a2ecec8ff61c470b6d452e7a98e8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to potentially harmful sites. The presence of multiple external URIs and the 'PDF_SEO_LINK_FARM' heuristic indicate a focus on external redirection.

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
  • 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.
  • 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://baarspo.ru/award?keyword=spasticity+pathophysiology+evaluation+and+management+pdf PDF link annotation
    • https://nanagupuwaxa.weebly.com/uploads/1/3/5/3/135322083/denutuwini.pdfIn PDF document text
    • http://mavaxur.mywebcommunity.org/pimaxaxoxosafamewaxut.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/74815542964ulgxl.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/62925675843.pdfIn PDF document text
    • https://karojigulad.weebly.com/uploads/1/3/4/6/134623473/pikotabubado_bidovas_keladukenema.pdfIn PDF document text
    • http://afracheat5.xyz/65308439296pmgk8.pdfIn PDF document text
    • http://oneitshop.info/sojivolabajiwojotu3j6pm.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/sony_fs700_release_date.pdfIn PDF document text
    • http://mazers.fun/chale_aana_whatsapp_status_video_wapwonp7pbm.pdfIn PDF document text
    • http://plsale.pro/xtz_750_super_tenere_manual7wtxj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ac592b-476b-4b13-99e6-422863644757/are_the_witcher_books_objectively_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61a809e6-3d6b-499a-8c52-b203f6fef36e/96528792580.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/garuwavaxojubikumov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5e5a34-a546-416f-97cd-8215b86fd75e/aves_sin_nido_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018f49a1-c66d-4b42-a131-20121b5b027a/first_aid_pocket_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/gemunad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7642734f-e35d-4d96-9026-de2428fbcf9f/how_to_reverse_search_image_google.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_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 5740 bytes
SHA-256: e6ca7c2243afff6073d5ca12c10fb808d2cde351b9cd5f8d185e4a0079167a7c
font_01_sfnt_off00012bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEE 10860 bytes
SHA-256: 265bf33307538de2d0e158796e58c16a2240688858cd18c2aee78273aaa4e179

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