Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb36eba90902a687…

MALICIOUS

PDF

72.6 KB Created: 2021-01-27 13:50:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b0a2190a0a85d50229c68be27592a420 SHA-1: cf51f8e8a6bf03daccca30566260c732d29c0ebb SHA-256: fb36eba90902a6879c68113c69cf8eb040216663e47a50fab0dba30582bb9593
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary external links points to a URL that appears to be part of a link farm. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and heuristics suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://jottigo.ru/123?utm_term=gloucester+ma+hotels+open PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fd6430ecfca3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487206/normal_60038e2e4d266.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/14a8012bb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490754/normal_5fd9e5d6bbbec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5ff362bb2b9f0.pdfIn PDF document text
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/junovugubivenoki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466146/normal_5fdf3a625f50d.pdfIn PDF document text
    • https://zififawatef.weebly.com/uploads/1/3/4/3/134384507/zovesitem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379961/normal_5fe12abc29c0e.pdfIn PDF document text
    • http://vatamulejuvovi.22web.org/20443308459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/waxegatulo/transformers_age_of_extinction_autobot_voices.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/laptop_touchpad_driver_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/your_name_title_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/83113668867.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/tesco_corporate_governance_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/gaxivubabaso.pdfIn PDF document text
    • http://xevivalekivo.epizy.com/sutonujunatos.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/interrogative_pronouns_french_worksheet.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/saturated_steam_vs_superheated_steam.pdfIn PDF document text
    • http://tixuxunu.epizy.com/dcf_florida_income_verification_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 5040 bytes
SHA-256: 33d29745681a4ad97e9a89a596697879f5e9676be03c58e7c8c9307124d685d9
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 10864 bytes
SHA-256: 508fea1003dc26bdbcc04f8670f7fc53c3ad5dcb8b32fe06cce41d8d01a07d97
font_02_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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