Malicious PDF — malware analysis report

Static analysis result for SHA-256 8449dce7ec775df3…

MALICIOUS

PDF

80.6 KB Created: 2021-05-23 09:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1a70bcbea99b95fdec6da133771a5829 SHA-1: a42fa818ebf0fd2cac0c4f7c5c83f28c5da5c338 SHA-256: 8449dce7ec775df3597f41c9ab08e4b275e57db286348531d258b7af8e89c05e
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic indicating it's a lure for free downloads, redirecting to the URL https://bologen.ru/strik?utm_term=photo+editor+app+free+download+for+laptop. This URL is flagged as a redirector, and the ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/strik?utm_term=photo+editor+app+free+download+for+laptop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463005/normal_5fd0de1c97a18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485576/normal_6008f2eddd8eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457332/normal_6004b424256d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_601000d887914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fd37c914eaed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_602999e41abc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530457/normal_5ffbaf4352e5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5ffab94a85340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426549/normal_6063383872de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_604146a69cb74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5fc854fed3f58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_6022d936da066.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387928/normal_5fc599cbe5d2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5fd18df12e0e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_600b3af11594d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5ff256aa6c6d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501212/normal_60679daa2bab2.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/zazelujeju/5748408538.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/memory_platform_wedge_sneaker_steve_madden.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/asean_and_member_states_transformation_and_integration.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/goxunowin.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/kademevof.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_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 5044 bytes
SHA-256: ef10e3ef8a5c53c873b7901391665da2294f1165d3a49198f9c14d0f1d8062ce
font_01_sfnt_off0001102e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102E 10768 bytes
SHA-256: ec6d006081a477e8d24c31f194ff1098269db22bd8b5dc0dcebfe5b593ff29d0

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