Malicious PDF — malware analysis report

Static analysis result for SHA-256 81646b51b4f852b9…

MALICIOUS

PDF

71.9 KB Created: 2021-03-14 23:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0f0a86f1cc2c7701e81a1fba4cb7685e SHA-1: 1999cf034c4d7693e716a507fb9d2877c6b263db SHA-256: 81646b51b4f852b995cfea9ace2c962faa0310f4559542db6df66470e29e09cc
126 Risk Score

Malware Insights

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

The PDF file 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 extracted, the sheer volume of outbound links suggests an attempt to redirect users to potentially harmful content or to manipulate search engine rankings.

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://ponafet.ru/award?keyword=netbeans+8+tutorial+pdf PDF link annotation
    • http://laserisesiseno.getenjoyment.net/sezidotoras.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/modelo_contrato_de_arrendamiento_de_vivienda_urbana_en_colombia.pdfIn PDF document text
    • http://gokojemisivuf.22web.org/rasuf.pdfIn PDF document text
    • http://mkr-olimp.info/pijoxorazivazcdbb1.pdfIn PDF document text
    • http://copyrightsupport-ig.com/bastien_vives_bdc66jb.pdfIn PDF document text
    • http://it50discount.pro/metro_2033_book_summaryev7zw.pdfIn PDF document text
    • https://bapanezuginu.weebly.com/uploads/1/3/5/3/135310050/vunibubikafi.pdfIn PDF document text
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/jajagakekuloma-makewarefun.pdfIn PDF document text
    • https://xuxijirabof.weebly.com/uploads/1/3/1/4/131406659/danigisepego.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/the_unwanteds_movie_cast.pdfIn PDF document text
    • https://tuxuboninivufos.weebly.com/uploads/1/3/4/4/134478209/bepituzerolas-melasadenabo-voxako.pdfIn PDF document text
    • http://xokezuwadem.mygamesonline.org/what_is_the_purpose_of_a_flammable_cabinet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_92d21e6cb7a54af0875f60c3be68298e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/scratchjr_2._0_apk.pdfIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_98d19a84c8ad40b39da6b6fb43bedc86.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/free_english_worksheets_6th_grade.pdfIn PDF document text
    • http://pamubaj.epizy.com/online_bible_study_tools_kjv.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_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 5336 bytes
SHA-256: 27715df0a82e9295d9b44ff38a21b64d4cc9f642f0c3cbead84c5647b446de30
font_01_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 11112 bytes
SHA-256: 1c1f801c39126a3e3dabf63d10f606c9ac7069026b57ae39b3d12ca4a7c3efb1

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