Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e81625d0e7a1f6…

MALICIOUS

PDF

47.3 KB Created: 2020-11-05 15:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 79849e586c2ed818eb06aa581a3ebeca SHA-1: 2eaf47f3a9dc2e72c834b1a11fc8193e5739daaa SHA-256: a9e81625d0e7a1f61982d3e8ff5a486775bb63fda4f21c09a8e9c6ae4b103e9a
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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=thinkorswim+web+platform+login PDF link annotation
    • https://gakexuguzadeza.weebly.com/uploads/1/3/4/4/134401700/xajonowi-vebufolekexowi-paradewa-tazifivali.pdfIn PDF document text
    • https://bikukanod.weebly.com/uploads/1/3/4/5/134583710/gitedupasijigutopege.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/jejudebux_farogajoza_paxup.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/4929228.pdfIn PDF document text
    • https://pewoxunoxosizix.weebly.com/uploads/1/3/4/3/134318290/268fcf3528bdf20.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/xobovakozagamuwo.pdfIn PDF document text
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/vujukisutomes-zegoteg-nofurekadexe-nidegovuvon.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/mijedusovineti/accounting_vocabulary_list_with_definitions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a7a66c-aea8-44e1-b7a3-da23d03f63db/5429161478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ff5318-4f9e-49e7-b608-97bb1333452b/71893321994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9451c0b1-5395-4ee9-844d-fad75ee545ce/16993237705.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_off00007631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7631 5560 bytes
SHA-256: bfb0198d698d12502647902f24e24ef5c4be12fec4f3623b3b059452c82225c7
font_01_sfnt_off000088fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88FE 11736 bytes
SHA-256: 408b45162aff6c1dabaaa618eb4252fab80eb9bf0ffc81c8a2f61b339d9782c7

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