Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d267f88bd2c97cd…

MALICIOUS

PDF

69.7 KB Created: 2021-02-10 02:48:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a0557025ed9da11d731ae038ae7afa22 SHA-1: c312dc6a7c60edd2c42f547bf50d226a4f4d372f SHA-256: 8d267f88bd2c97cd3bf08115b3f0836367ca450878989998d350d1c7ad1ce816
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the link farm suggests it could be used to host malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=anger+management+activity+pdf PDF link annotation
    • https://cdn.sqhk.co/vaminika/eXhcGjh/layton_brothers_mystery_room_apk_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/somujatiza/nd0phb3/funny_happy_new_year_2020_gif_video.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/gjji0gc/mini_4wd_legend_offline_mod_apk.pdfIn PDF document text
    • http://kogutipabu.22web.org/70256841533.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/67692894196.pdfIn PDF document text
    • http://doxugivo.22web.org/bogamiwatamufofiropupawi.pdfIn PDF document text
    • http://tinuliv.22web.org/warajidil.pdfIn PDF document text
    • http://bogaxusamukuxid.22web.org/kabir_amritwani_song.pdfIn PDF document text
    • https://cdn.sqhk.co/nalomuxe/Ggejegc/lipato.pdfIn PDF document text
    • http://xebobimifu.22web.org/zikobuwakufikek.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/norasukatew_xuxoja_sodipab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasazaxara.rf.gd/15816377011.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/34393928500.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/guided_reading_activities_ks1_new_curriculum.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/lewonopodavalevulolilamox.pdfIn PDF document text
    • http://govetijedofesol.rf.gd/83729631255.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_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 5416 bytes
SHA-256: 1f272cee75621d090fe3af8d9c0fb6c468ee7997bc5f6bd9e73b96b9323f6c56
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 10596 bytes
SHA-256: be582d6411368add91d77c703080a4d2c0f443a46a67babb3da6631851601997

Open this report in the interactive analyzer, or submit your own file for analysis.