Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25d362bb4382ea9…

MALICIOUS

PDF

51.9 KB Created: 2020-11-09 15:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b240bba23b872cdbce168c8b5d211610 SHA-1: 87558d458867ad1094788780d6ef3e52df572620 SHA-256: e25d362bb4382ea9770a5bd6aec438e68da1e2d384b967e4f0a0df515a86089d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm or SEO manipulation scheme. One of the embedded links, https://trafffe.ru/aws?keyword=jacob+s+ladder+piercings+balls, is flagged as suspicious. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be directing users to external resources, potentially for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/aws?keyword=jacob+s+ladder+piercings+balls PDF link annotation
    • https://jilanuma.weebly.com/uploads/1/3/4/5/134522828/dafutetosewexubiwiwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5f98f26c895bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5fa18fb0e54c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f9356d0a5ba0.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/buxamofezo.pdfIn PDF document text
    • https://sesizapilutib.weebly.com/uploads/1/3/4/2/134266568/4138467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5f903dd7cf858.pdfIn PDF document text
    • https://zufeburiz.weebly.com/uploads/1/3/4/3/134320035/0bbcb075f1b757.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/108da588d8fe70.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/e87b1fd2.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/fbdf62c7-f7a5-46ad-9d67-9331eedea217/dujatebomavixixesuna.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/drive_in_theaters_athens_tn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19388763-443e-404d-b8eb-bc3b4691a1e7/reader_s_digest_complete_guide_to_sewing.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_off0000892c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x892C 5368 bytes
SHA-256: cea0711f6505b90ecb8233b73f3239b6becc3e3556968b9b17b1a046fd6ffff4
font_01_sfnt_off00009b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B72 11712 bytes
SHA-256: 63b7b17866680bdcc2110acd401d9ea570ece933ea7cbb85127b9378c4f3fe27

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