Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dc4c860408d145…

MALICIOUS

PDF

77.1 KB Created: 2021-05-21 17:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3ae6a2b4847b0e037f1a03707e78fcf5 SHA-1: 0b7998564f7e7b959af61043314ef07adf0b63ce SHA-256: 23dc4c860408d145e16f2d2d740dd14cde30fd87765ebeceb8ec57b4c0163580
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on directing users to download cracked software, specifically 'Abbyy finereader 14 crack google drive'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://pelibifir.ru/strik?utm_term=abbyy+finereader+14+crack+google+drive PDF link annotation
    • https://desotidibig.weebly.com/uploads/1/3/0/7/130775813/4773960.pdfIn PDF document text
    • https://pagopolekabob.weebly.com/uploads/1/3/4/3/134305888/49b37400cc.pdfIn PDF document text
    • https://guxitubekin.weebly.com/uploads/1/3/4/2/134267073/vaxonita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5fca3f2090173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415322/normal_5fee363a5c565.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/7382086.pdfIn PDF document text
    • https://vifawadezak.weebly.com/uploads/1/3/4/8/134846548/5844866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_6064d8822dba0.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/pagiromunaluso_xezezanuxodu_logajekezav.pdfIn PDF document text
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/kojuk.pdfIn PDF document text
    • https://nefotinabe.weebly.com/uploads/1/3/5/3/135314884/sufidasira_babikisiw_natifarex_funak.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/79df95a3-eda3-4494-ba34-887cb97267e1/barcode_scanner_2d-_honeywell_xenon_1900gsr-2usb.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/what_religion_is_judaism_based_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeeb95ea-db74-49ce-b644-3db7330c10f7/is_salicylic_acid_safe_for_scalp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ce1448-79fa-4317-bc16-679e42c151ba/zurirupugofezewazefisofu.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/how_to_read_a_guys_facial_expressions.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/6515140431.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/fenaxilesa.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/nokojuzivelol.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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 5504 bytes
SHA-256: 1dea171140c7a093d4c6c9a5f15b04a0d0234e26e1cdb7ff916198089110b337
font_01_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10984 bytes
SHA-256: 435f92e6e275f87024404dbc413ac7aac0882b7ad7d4ac8487ab5befab35ba23

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