Malicious PDF — malware analysis report

Static analysis result for SHA-256 811bff7953122497…

MALICIOUS

PDF

81.6 KB Created: 2021-04-25 19:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a18f0bc0abbf21459771ae6e8a0715e6 SHA-1: 567637be0ddb44bb10f7ded8060aad834252fafd SHA-256: 811bff7953122497356ebe0e26c3a53c41546ca272915df0dbf4de041a4ad8d6
96 Risk Score

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 0.9996

Heuristics 4

  • 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.
  • 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://zajinet.ru/strik?utm_term=simulacra+and+simulation+book+depository PDF link annotation
    • https://dakezevowefop.weebly.com/uploads/1/3/6/0/136088489/2114500.pdfIn PDF document text
    • http://tajevis.22web.org/acronis_true_image_2017_manuale_italiano.pdfIn PDF document text
    • https://juzajepilokak.weebly.com/uploads/1/3/4/6/134682244/3997060.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/b52ffd47685ae44.pdfIn PDF document text
    • http://peferiselavumi.iblogger.org/5345613210.pdfIn PDF document text
    • https://zinikedefi.weebly.com/uploads/1/3/0/7/130740178/9968674.pdfIn PDF document text
    • https://pepodefaposuv.weebly.com/uploads/1/3/5/9/135992330/gemek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/quiet_by_susan_cain_ted_talk.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/35800213253.pdfIn PDF document text
    • http://damabop.epizy.com/gidomupexuverego.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/balancing_equations_worksheet_10-_2.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/91378643601.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/vigijugof.pdfIn PDF document text
    • http://jisipisadelotab.epizy.com/hp_deskjet_2620_all-in-one_wireless_inkjet_printer_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/rufivakepox.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/placito_cassinese.pdfIn PDF document text
    • http://somupoxalinarek.rf.gd/baofeng_uv-5r_chirp_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/what_will_a_4000_watt_inverter_run.pdfIn PDF document text
    • http://sosunakefimafo.rf.gd/statistical_methods_for_recommender_systems_download.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/basara_temple_information_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/5905901140.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 5628 bytes
SHA-256: bc32630e383ba6abdb7003a65a0a5be70b35294e32e5eadef5eb26870b75703c
font_01_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 10816 bytes
SHA-256: 165ae2c4a3b3931620d7d7aa29b109aa1a67922e8bb197c7674c1d32a0748a16

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