Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec5505d6711000c…

MALICIOUS

PDF

85.5 KB Created: 2021-03-12 15:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 33f53517007df10245799dc599ca8117 SHA-1: 23e4850e727b1d6cb43b0a4f3285c9fef1fd8775 SHA-256: dec5505d6711000cd53410d003f2e53ce8fe3cce52a5e5ec0bcc4e9ac76c3d42
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains or link farms, suggesting a malicious intent to redirect users. The ML classifier strongly indicated maliciousness, and the PDF structure points towards SEO spam or phishing tactics. No scripts were extracted, but the presence of numerous external URLs indicates a likely attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=rate+analysis+for+brickwork+pdf PDF link annotation
    • https://cdn.sqhk.co/nexuliwadi/Gj5otgi/95936646444.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/nunusilelizetep.pdfIn PDF document text
    • http://groby-ritual.online/968790451133929s.pdfIn PDF document text
    • http://akb54.ru/advanced_engineering_mathematics_greenberg_solutionshdgd5.pdfIn PDF document text
    • http://zanartcc.net/baazigar_song_mp40n7th.pdfIn PDF document text
    • https://cdn.sqhk.co/jasuxerazifo/RKhGdih/dead_city_game_walkthrough.pdfIn PDF document text
    • https://wokukowuvewa.weebly.com/uploads/1/3/4/3/134316041/ad620d7.pdfIn PDF document text
    • https://juvidefe.weebly.com/uploads/1/3/4/3/134319267/botoverululunosopi.pdfIn PDF document text
    • https://nemapawa.weebly.com/uploads/1/3/0/9/130969411/af345.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405206/normal_5fdf867cf067c.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jgjZwEH/wifipidanusi.pdfIn PDF document text
    • http://fasad-dom.site/jotul_f100_nordic_review5suqs.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/ciiY2Bp/5792436539.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/wijebositor_lozalekul_jolur.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/b8xgdXn/photo_lab_picture_editor_face_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_602c38f037c43.pdfIn PDF document text
    • https://zozizifubigidoz.weebly.com/uploads/1/3/1/4/131409074/1031187.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://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_c7f3e8e92bc64ec3afaafb2e4c21b9fc.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_57d7c2df575a48299f3e5dfe60e50d90.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_0ef6a61ac75b4f7ebdb09203c14f1afe.pdf?index=trueIn 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_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 5344 bytes
SHA-256: 7f19d7434457b8d67d3a3c70bdd284b942997cb6022a846e0f7ba6603c4698cc
font_01_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 14604 bytes
SHA-256: 255714de2b904ec97f6d74b64e89095ee74d5c554c5b5d30a6e3aad4adcb5710
font_02_sfnt_off00013a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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