Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6d8137886c5cc1…

MALICIOUS

PDF

83.2 KB Created: 2021-04-15 21:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: da4d7840df623cdf4298b0477bbbe3a9 SHA-1: 79cf004e9da2bc69df06795c261b4f252bcf54a4 SHA-256: cd6d8137886c5cc1d540724fcde1680990e7c8b9e5591bb5790a24fd8cfedfa7
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of an external URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=flysky+fs-gt3b+dual+rate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366005/normal_6063a0cc8b412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6065fc68bc802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393893/normal_6027e8741c2ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_604d39bcdae79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_601a155615edc.pdfIn PDF document text
    • http://saleproducts.pro/probability_distribution_expected_value_worksheetxv73v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451563/normal_6003e4f31484c.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/Cghhhje/lezan.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/M8Od7gg/34666616455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_603b6d1658f31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460045/normal_5fef62ca1edd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5fe9fd4373e68.pdfIn PDF document text
    • http://otomail.business/how_to_use_a_ronco_dehydratoreimph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425227/normal_60693fa0cfd64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_60323551b19b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_60021d8e5bc3e.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/hhwKihy/pabis.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/GHif0hc/12693150587.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403819/normal_5fcd44db6aec2.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/zuniverijesud/login_page_react_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/visiting_cards_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/2000_ford_ranger_seat_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/data_science_ms_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/95265149527.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_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 5532 bytes
SHA-256: 6a38641845076d00f126d5e42fc5a5129cc5f15fa6ed8b9ff4b4be2b82d1ce50
font_01_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 12188 bytes
SHA-256: 0ecdc9e31f06811c7fe3932736142c263f5d7ab09ae094565fce8263f4fe39ab

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