Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fd8ccf32844e67…

MALICIOUS

PDF

81.0 KB Created: 2021-03-02 01:27:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eb78d82c55ef895e7f0fd326738c325f SHA-1: 0809fcd7400681d53fe24297869dde597724bc88 SHA-256: 71fd8ccf32844e672af4bf7ef30e4159dff081223d7569f33c3ee7f446873317
144 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 lure related to generators and urgency, directing users to an external URL. This URL is identified as a redirector, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=who+makes+the+best+whole+house+standby+generator PDF link annotation
    • http://jaxakevog.22web.org/gillingham_primary_school_ofsted_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_600c541d77e9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403274/normal_5fc5f49089060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_601f0e014764f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5febcd9b9a09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd611b97c86d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_603748003163b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464053/normal_5fce3f54e27e9.pdfIn PDF document text
    • http://zavudonalu.66ghz.com/78467157710.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393626/normal_6003b1936904a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_602effe923a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473938/normal_5fd2aa92bc882.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/bubodeliza/metformin_in_pregnancy_acog.pdfIn PDF document text
    • http://valapapiwusujeg.rf.gd/48556466405.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/android_hd_mod_games.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_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 5652 bytes
SHA-256: 2f488923e76e41700c43bf356ad70401f616c79beac92b3d49743fef5d987ec0
font_01_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 11560 bytes
SHA-256: b95656af83a409915305df901109f1e489693447b1d4db5172e916952e997bd0

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