Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd340a65c5c236e8…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 14:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 643b1f4c5855eaadb792b3e313b49349 SHA-1: d6c77ea751f0d9fe5e9d7a9f4af9c5ba869b1914 SHA-256: cd340a65c5c236e8589f34ea752d844bfa797ce2d8491dfc1965a74d952cc5ef
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, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is likely part of the attack chain. The document body, though heavily obfuscated, suggests a lure related to health information to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=adolescent+and+youth+reproductive+health+pdf PDF link annotation
    • http://profapp.pro/nys_sex_offender_risk_assessment_instrumentnggd0.pdfIn PDF document text
    • http://shopsmmv.site/how_long_to_prepare_for_usmle_step_1urmf5.pdfIn PDF document text
    • http://shopeuro.pro/7308393237252u0g.pdfIn PDF document text
    • http://sweetygirl.club/13841196704nvrqo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_601a31f01603b.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/bootstrap_animated_slider_template_free64uke.pdfIn PDF document text
    • http://pagebake.com/what_does_the_lotus_sutra_teach_brainlyywmyh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452217/normal_5fea229e22058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_6047bc736501a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_604920c17a121.pdfIn PDF document text
    • http://cetop.xyz/853712397965d1gb.pdfIn PDF document text
    • http://copriyghtconfirmed.com/class_4_math_guide_bookn2wa9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393204/normal_5fc98821714f4.pdfIn PDF document text
    • http://catsism.com/509603654426xspb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ridoretuj.rf.gd/golongan_obat_bronkodilator.pdfIn PDF document text
    • http://muxenad.rf.gd/market_wizards_jack_schwager_audiobook.pdfIn PDF document text
    • http://kesexawes.rf.gd/jimexajujolozifibuw.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/how_much_are_baby_g_watches.pdfIn PDF document text
    • http://gonidiwofove.epizy.com/aprendizaje_colaborativo_definicion.pdfIn PDF document text
    • http://surobufalinaxis.epizy.com/dead_to_the_world_lyrics_nightwish.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/vavobaponudakokorerinem.pdfIn PDF document text
    • http://bexiponezewan.rf.gd/tafapubonawapolefebu.pdfIn PDF document text
    • http://rawodofomer.epizy.com/nujobune.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/juzerib.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/aftermath_full_movie_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/folder_template_sharepoint_online.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_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 5392 bytes
SHA-256: ab1d1beba4f1968d97515caa064cc5ba540583c7f46ebe6153a497b6ef5b1e32
font_01_sfnt_off00010422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 12108 bytes
SHA-256: 16518082ba8052231bd3346c1cb8dcdfe66e72532c035d32528efb42e8a505ef

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