Malicious PDF — malware analysis report

Static analysis result for SHA-256 de83cdb66b82ee2f…

MALICIOUS

PDF

71.1 KB Created: 2020-11-23 18:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 27970bc23c5131e52bf76c54fae01056 SHA-1: 25c1bc93a005449984555f7c4b8d81134e8a0328 SHA-256: de83cdb66b82ee2ff2228330f6f1b974a236f8ea364edf631e09ddc9ecb7a938
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. One of the primary URLs, 'https://traffset.ru/123?utm_term=5th+grade+school+supplies+list+2016', appears to be part of this link farm, potentially serving as a lure or a redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/123?utm_term=5th+grade+school+supplies+list+2016 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5f9ae7ce70a70.pdfIn PDF document text
    • https://xukukotazu.weebly.com/uploads/1/3/4/6/134654047/fagakorimexewo_nebipotomeladub_gafavoropovu.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/waxapoz/red_elephant_club_huntsville_al.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/tevegetiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce25420a-6f8e-4515-9c07-f376043889a3/xanthers_guide_anyflip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d91541e-316b-473b-a995-4bc98bbed398/xonivinesiwigamow.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/minecraft_building_perm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0d8673-9a20-4702-9cbb-0a6c197a9221/vetuwexidudikepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7c3f24-59cd-46c5-af8b-f62650dd01d8/clintonville_high_school_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031404e4-fb7b-4519-aaa9-6c602666aabf/96688084171.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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 5844 bytes
SHA-256: b8a9d29ca3629a1e50a9facfc364b5e6f3266dfa65e50b3b86ea9e881a8e8ca8
font_01_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 10416 bytes
SHA-256: cd38367fa930fa294c0d99a9d982a3365834f1491b62d0c34e8f5552cd555187

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