Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ae779acdcfdde6…

MALICIOUS

PDF

120.4 KB Created: 2021-03-29 16:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d00b66387cc1d0fdbe2bcab9a526ee74 SHA-1: 522cb23a9a6dd1c71a7394a62cf068f88adbeca8 SHA-256: 58ae779acdcfdde6f1c12b09ecc2d34acfe93cdfb9b38417f7a2b371651e4871
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to malicious or ad-heavy content, potentially as a lure or to distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://seumenha.ru/strik?utm_term=100+a%25C3%25B1os+de+soledad+en+ingles PDF link annotation
    • http://ru-payment.casa/gewikege2p6c1.pdfIn PDF document text
    • https://cdn.sqhk.co/xajimujigaju/hNjaKji/79388921330.pdfIn PDF document text
    • https://dakijixubuleze.weebly.com/uploads/1/3/0/7/130740496/wemupanisinu.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwasazafu/UhgjbvJ/dubenesetatukegexowivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_600e081bd487d.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/c561f1b.pdfIn PDF document text
    • https://tijikazi.weebly.com/uploads/1/3/4/3/134373218/rapiwagujifaxelugova.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/fbqFPjc/gopro_quik_video_photo_editor.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/JpIjfia/41151414252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_60586be469f23.pdfIn PDF document text
    • http://wrestling-mma.com/wolovuxabineb7o5em.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5ff4fc114a8f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_604b71f9a3795.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/a14ed183bd3b300.pdfIn PDF document text
    • http://intereriia.com/pawodufexunidakuioa7h.pdfIn PDF document text
    • http://vsspb.ru/simple_tai_chi_exercises_older_adultsnv13x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387037/normal_5ff92e054b168.pdfIn PDF document text
    • https://vesukinixemijuw.weebly.com/uploads/1/3/2/6/132696016/xobawuru-vusabelani-resakabesilul.pdfIn PDF document text
    • http://psychologyrelax.xyz/jands_vista_2_controllerb349n.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/2dc6a63b-9085-4cc0-aead-eaef11ca6941/the_outsiders_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2fc34d0-cd5b-4c22-afb1-976ecd926099/bubble_answer_sheet_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e38b469-0586-4730-a01c-0f2fe76106e8/ruvixanarona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1f0316-2114-4c4f-ba91-73d46794f15d/nugijiruvejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f6623e-1e6a-4ee9-8469-d69c0387fb69/12554371433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c7a512-32fe-46aa-aabe-c53a4ae0c523/32883234709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b3bd3f-d714-4cf6-a369-53a3533d40ef/who_are_the_rich_brothers_gardeners.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_off000182df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182DF 5516 bytes
SHA-256: ef7eab282e9be86ca4d60ccbc3185e98f33c0137ba6138acc73a5b5520418d86
font_01_sfnt_off00019626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19626 5208 bytes
SHA-256: 44533730734c97ad503eb736cc26e428e96c55fa829d1479ae717a1d489a795f
font_02_sfnt_off0001a7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7B1 13112 bytes
SHA-256: ab6f478144e8afe6fcfc04d451e2240a9d1611e6b0928445a1a08a23e71afe27

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