Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa98c145c03641ff…

MALICIOUS

PDF

70.9 KB Created: 2021-03-13 20:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 902c1aa170579c5f87230d912b63e65f SHA-1: 5fe58ab32392c9c67bf6a35c3ac9a864805a3df3 SHA-256: aa98c145c03641ff2dec326ec6f9c06cddb763c8cb731d0021492c4468b36ba5
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://ponafet.ru/wix?keyword=gramatica+1+capitulo+1+answers+holt+spanish+2 PDF link annotation
    • https://cdn.sqhk.co/jugomuzuteb/jeggjbH/xtreme_stunt_bike_rider_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/papowepu/ejdCn5V/18761137128.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/DidDTi7/goosebumps_night_of_scares_chapter_3.pdfIn PDF document text
    • https://cdn.sqhk.co/fanalotozor/gcmicei/36992371650.pdfIn PDF document text
    • http://easy-money-cash.space/pandora_hearts_caucus_race1pp11.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/aicpgeH/samsung_portable_ssd_setup_mac_1._0._pkg.pdfIn PDF document text
    • http://mebel-albero.ru/is_jbl_flip_3_waterproofnkdrv.pdfIn PDF document text
    • https://cdn.sqhk.co/gediwuwanol/dqgdjFh/35771182324.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/S4Mgdii/63150191375.pdfIn PDF document text
    • http://diwizog.22web.org/game_dev_story_2._0._3_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulevusevugola.epizy.com/19363232428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b934d4-c244-48a2-a606-b454dbfc60d4/kafusibuxuzi.pdfIn PDF document text
    • http://xosumuzav.epizy.com/nebinumujunininaki.pdfIn PDF document text
    • http://pupovedifa.rf.gd/61795623368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3ea0ca-0950-4ae7-b485-f82f6d75929a/voluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2038f1d9-ffa3-462a-9219-c6cc6b4346b0/79108515356.pdfIn PDF document text
    • http://kexafaxepel.epizy.com/ahmadou_kourouma_livres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef126bb-31c6-4c32-a3b4-04293d2959c8/alligood_nursing_theorists_and_their_work_9th_edition_free.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_off0000d4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 5480 bytes
SHA-256: 341d803321338ca9d307977fc3b172915978ea66d10356e9369f7c48ee79f761
font_01_sfnt_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 11800 bytes
SHA-256: 86b8690692d678877f95dedb5fb39a0e2be9c21c071d47885d79afb619f3457d

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