Malicious PDF — malware analysis report

Static analysis result for SHA-256 7638629634adfd87…

MALICIOUS

PDF

75.9 KB Created: 2020-11-28 21:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e23b4637c2b12948834db9c6ef06fe79 SHA-1: 2ca96c3d9381a84cd18d21141876d00d6ff9bf7b SHA-256: 7638629634adfd87dd8d61f87c8c671831b61ffaeaabab7d5f3fc2123993a2e4
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link farm and an SEO redirector pointing to 'https://traffset.ru/aws?utm_term=appendix+vermiformis+pathology', indicating a phishing or malware distribution attempt. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The presence of external links and the ML classifier's high confidence score suggest malicious intent.

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://traffset.ru/aws?utm_term=appendix+vermiformis+pathology PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5fc18010ec6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5fa35ec3ead59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_5fa509b158dc4.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/61a0a9e01b0179.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/vavapekadoliti/14583097644.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/34270768847.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/address_labels_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bca7966-6e82-4555-b737-1cd9c32f70f2/11053296136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/751011d8-dc15-46a4-afc8-191baf93ffda/34395007597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69687637-e981-4804-a587-20847cfb6aeb/guvaxajuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d478aa55-2cfa-40bf-9c0c-e36c70aad384/vista_20p_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea70d92-fe4d-438e-bc3c-67e53eeffec4/beyond_the_edge_movie.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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5672 bytes
SHA-256: 5557f31541abfba097b21f33b2ab4c86f2e356bef8063285795787b89bc8fe3a
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 11668 bytes
SHA-256: 83bf88f98c0ef1b217ba69e1688d0414a16876a4b31ac9ea33aaebda74a6edf8

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