Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d8b5ceb13f7bb1…

MALICIOUS

PDF

65.4 KB Created: 2020-11-25 12:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 377c5049e38a18849d0b7bdde33b7697 SHA-1: e654613e1b230c952b479fd906baec8bc5d45b56 SHA-256: 85d8b5ceb13f7bb1ba04b5709314f0685153c5579bf7b135c2d35282a1b74753
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains an embedded URL that redirects to a phishing site, as indicated by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing. No scripts were extracted, but the primary attack vector appears to be a malicious link within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=chicora+long+term+rentals+myrtle+beach PDF link annotation
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/7819088.pdfIn PDF document text
    • https://wojegapemepuwa.weebly.com/uploads/1/3/4/0/134096127/xufazabezig-lijilabovi-sexekuto-givegibidizugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387582/normal_5f9cb593dd065.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/miwolezedubujoz/8706618757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f28a048-2245-4f8f-a503-4e1b1d0a3320/alphabet_trace_sheets_printables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e906182b-5357-48dd-b93e-ff24e059f570/tc-p50s2_power_supply.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1cd8cb-085f-48da-bff5-24c0aa0d4ca6/how_to_put_babysitting_on_a_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c199173-ed4c-4311-95ab-44d7a44ed0b5/cardiologia_pediatrica_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4540c9-ece8-4090-8ec4-37b54d3ce245/56272948644.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/pujunuwuj.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/amvic_inspection_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d6430a-8f20-4c31-8bac-ba6fc6fe00ea/pibiguz.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/roku_pin_for_disney_plus.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_off0000c464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC464 5360 bytes
SHA-256: 80a56efe1ad52e151602164e679dc592fd0953ce4875fba8407c69beda7a8447
font_01_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 10156 bytes
SHA-256: b5f8bdc3b9cf108b843adefc159bd63fcc0929e50cfdc97fc9552d5b7feaf95e

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