Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92fd2003428dba9…

MALICIOUS

PDF

64.3 KB Created: 2020-11-17 10:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1e44b800216512cf32d14adaa2f1288f SHA-1: 23cc0ecf5a9ab38a133afc521de737996b271546 SHA-256: e92fd2003428dba98056ed542b8feb9ad9e62e8f539e2caea98d5af09257e4a6
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and an SEO redirector, designed to lure users to external sites. The embedded URL 'https://traffnew.ru/123?utm_term=homeless+to+harvard+worksheet+answers' is presented as a worksheet answer key, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to deliver a malicious payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffnew.ru/123?utm_term=homeless+to+harvard+worksheet+answers PDF link annotation
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/4413828.pdfIn PDF document text
    • https://jetijejage.weebly.com/uploads/1/3/4/3/134319548/vesivowum.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/sirowubojo_tinadizab_nejomisupano.pdfIn PDF document text
    • https://lotogifivetizub.weebly.com/uploads/1/3/4/3/134309957/d4ddc6d73.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/f9055274-7b69-4868-b52c-71196c774fa6/philippine_flying_dragon_for_sale_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/becbd599-6008-47c5-8fbe-4130196dc97d/vivumifuwow.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/26099555413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11ded90d-c954-49d8-ab37-b4e4bad72459/lakiwevezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b3749b-c67f-46a8-8df4-95ba81ae167c/convert._eml_to.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f505f4e7-6de8-4d72-a6d6-799421206dc0/22912335845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1301d8-96dd-408d-bc46-6e9241d31e69/22590916786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb5e2d8-d935-45a4-bef4-34d698eece5f/87681099473.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/vewanizevatufikubiguke.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/gewikipanabu.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_off0000bff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF4 5244 bytes
SHA-256: f805579fe61658507b873e7b797ff0230fb3ff2005183a73bb177effb9d0dc41
font_01_sfnt_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 10284 bytes
SHA-256: 5c157d28bcebb5069bb5dda42026710ea9f17e21e4f7f34e7ae56a675d88a277

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