Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1dc05d53c8428d…

MALICIOUS

PDF

70.4 KB Created: 2021-02-26 07:32:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4d09b93501775b79c96a24c8f70e205e SHA-1: bdabab525ffcc8a0a1c9aaebc08319dbbb9ac462 SHA-256: 8a1dc05d53c8428dfab344965d7cc2b7b80eb0c0242c039bcd011f491771d9e2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external links, with one specifically pointing to 'jacksth.ru' and a keyword suggesting a technical lure. The PDF's structure and embedded links suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=docker+invalid+reference+format+repository+name+must+be+lowercase+pwd PDF link annotation
    • http://fb-pageunderreview.com/final_fantasy_iv_the_after_years_rydiaguwjh.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/hdPzigj/33231442102.pdfIn PDF document text
    • http://naguvogegexaze.22web.org/benomililipufejifo.pdfIn PDF document text
    • http://my-favshopg.online/scoreboard_football_apkp21m0.pdfIn PDF document text
    • http://frukt.space/carols_of_the_bells_songr2tdr.pdfIn PDF document text
    • https://cdn.sqhk.co/nigudovowa/highibt/top_10_ringtones_2019_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sanemogoxidiwus.epizy.com/ieee_iot_journal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/sisugamimanerekuz.pdfIn PDF document text
    • http://dimaninerif.rf.gd/netflix_for_android_4._4._2.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/autotune_program_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/71606047470.pdfIn PDF document text
    • http://tutegijuvejok.epizy.com/cracking_tools_pack.pdfIn PDF document text
    • http://pujumek.myartsonline.com/french_revolution_third_estate_taxes.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_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 5760 bytes
SHA-256: 947e6bd6ed955c571d8039202062036c9a946263445cf5e3a63ac1017c049df7
font_01_sfnt_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 10700 bytes
SHA-256: 6313bb6b6c605480a2ee9c089097ed4a1b17fcd51e095d0f34cf6a25d5f3418c

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