Malicious PDF — malware analysis report

Static analysis result for SHA-256 26312d0dd97a4268…

MALICIOUS

PDF

75.8 KB Created: 2021-02-17 18:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4c7486ce911fa0705af9859507302c4d SHA-1: 2ffb59974f7a6810336052ea8af30235796378cc SHA-256: 26312d0dd97a426884848d52cb1e12e3ec218fd3791c30fdded7ebb00675f241
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 0.9998

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://crophysi.ru/wix?keyword=the+ethical+life+pdf+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464522/normal_5fcf9faaadbf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_6017433654ab4.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/yjhgjCY/pakisewilizavukufagubi.pdfIn PDF document text
    • http://piguzipudoval.iblogger.org/free_online_advertising_platforms_in_nigeria.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373776/normal_600898a9b3fbc.pdfIn PDF document text
    • http://letxxnx.org/under_seat_subwoofer_box_silverado5c89h.pdfIn PDF document text
    • http://vsedlyatebya.xyz/89988043073d5nhg.pdfIn PDF document text
    • http://abzac.me/623649315784qdsk.pdfIn PDF document text
    • http://procripton.com/medical_bacteriology_lecture_noteswl88z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5ffa863041e80.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/4069553.pdfIn PDF document text
    • https://kufurana.weebly.com/uploads/1/3/1/4/131482954/3234745.pdfIn PDF document text
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/baroz-pilufadu.pdfIn PDF document text
    • http://notdull-eng.online/48153960697h3jfv.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/e0b1f2320ec.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/mogipegi/lonodeniruk.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/revenue_analysis_report_excel.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_off0000e218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE218 4588 bytes
SHA-256: 8aa09c2a972fdb41d8aa8ef399b0eb6ec597db45132fb7242db1ad3060976acc
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 10092 bytes
SHA-256: 6d63221abcd48f87cdfd7bcbccd320dee4a2ea71d136aaa5daa37a15e68e2141
font_02_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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