Malicious PDF — malware analysis report

Static analysis result for SHA-256 656405eab65d1579…

MALICIOUS

PDF

81.3 KB Created: 2021-03-21 09:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: db7caa0fe41c38f1f5fd3fed5d7abfbd SHA-1: 3cc3e4e89de189e6c47b3ce39733d7c2c607fb48 SHA-256: 656405eab65d157951a0b4806763b25c26d6aa5ec864ae3fd991c8481c20ee85
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is likely a malicious domain used for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain keywords related to search queries, suggesting a lure to a malicious site.

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=hill+climb+racing+best+vehicle+for+money PDF link annotation
    • http://gonifarej.mywebcommunity.org/tepadineranagevi.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/birobijepu.pdfIn PDF document text
    • http://fibewoz.22web.org/mivigo.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/4hhZZEU/76360170337.pdfIn PDF document text
    • https://jinonapipi.weebly.com/uploads/1/3/4/4/134481743/welijikuzupa.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/59136863580.pdfIn PDF document text
    • http://fudipowituvu.22web.org/cartoon_cat_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/omkWnif/pinorixavutumenepexaxatu.pdfIn PDF document text
    • https://rubovumalez.weebly.com/uploads/1/3/4/4/134458479/2225265.pdfIn PDF document text
    • https://dinelelulom.weebly.com/uploads/1/3/4/3/134308509/0f3c1a40051070.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/computer_accounting_with_sage_50.pdfIn PDF document text
    • https://laregokirula.weebly.com/uploads/1/3/0/9/130969776/marorenixu.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/sevofafegeba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifojizu.myartsonline.com/doledidizunufaj.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/best_short_stories_of_all_time_reddit.pdfIn PDF document text
    • http://lugorigarotari.epizy.com/evidence_based_research.pdfIn PDF document text
    • http://boxemoje.epizy.com/80909919368.pdfIn PDF document text
    • http://repajazofuwide.epizy.com/23470194228.pdfIn PDF document text
    • http://zuramebegufal.rf.gd/muviwe.pdfIn PDF document text
    • http://kijapomenenuwev.epizy.com/la_casa_de_bernarda_alba_characters_analysis.pdfIn PDF document text
    • http://vogasuzifen.rf.gd/what_is_fluid_dynamics.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_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 5560 bytes
SHA-256: c9924b2d2b7762e8572f3e28540bd5009021dcabd0e2fb10c66f1b0ab2a0d291
font_01_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 10820 bytes
SHA-256: fa86bd7892474ecb03aae429f5ee690c152a5afa1c7899025c359bc27453483a

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