Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26a07bf1a65e356…

MALICIOUS

PDF

71.8 KB Created: 2020-11-18 00:06:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: efcb7072eea3e428bbba8dfffad836dc SHA-1: bb58c4b61d5c6470f63fb65837a4999c41745a4f SHA-256: e26a07bf1a65e3569bef07930abef2bbdf2af02bfc6ada53b0127f15df2a052e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggtraff.ru, which is indicative of phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM also indicates a large number of external links, with the first pointing to a suspicious S3 bucket URL. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a lure for a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=cuisinart+coffee+on+demand+dcc-3000+cleaning In PDF document text
    • https://jugusunoju.weebly.com/uploads/1/3/4/6/134625161/f82df6f.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/jevuxozazebazug/jiditabidovowenoxuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79425d4d-939f-4bbb-b659-c65737a31b91/sample_letter_dispute_collection_agency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb722cc6-4d3d-42bb-a514-fc1d57f54e7b/1103817132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d77406-0319-42ed-b9c7-eec47e260286/51392379975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdd10b2-a625-4f60-85f3-1c1cc0527374/75159665162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8d63d8b-95a2-4405-96b2-50a04c7eeecf/xasowurapukafel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1baea4fa-fd98-43be-a43b-5ed144514d72/xuwizalidibekatelifuxiven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b023b704-8583-40d4-89f8-57662976e493/dugibozopowakilib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7c6d82-5cac-4cd8-b819-1092a5444b77/24407252613.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC785 5584 bytes
SHA-256: 13544b9b73883dcb40b8207859f6accac8ee0824c2595e90330f292528f1c065
font_01_sfnt_off0000da6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6D 10156 bytes
SHA-256: 85c4eefa17c7f66a49627923a72e03de2c90a7c19f7f41c6c8f929a0c3fbef64
font_02_sfnt_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b

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