Malicious PDF — malware analysis report

Static analysis result for SHA-256 2712572fadac8031…

MALICIOUS

PDF

83.2 KB Created: 2021-04-09 02:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 813c40ab88cca20ac3308574e27a846b SHA-1: e6da502369736d4d239150826e4dc1eccafcc3be SHA-256: 2712572fadac80314420715124b84ee3c0e56c9f12ded97dd0b15e5b12c5446c
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The primary malicious URL identified is jumiwimov.ru, which is likely used for phishing or to serve a second-stage payload. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/strik?utm_term=directions+to+vanity+fair+outlet+in+reading+pa PDF link annotation
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/xesafuwit.pdfIn PDF document text
    • http://wutanitof.22web.org/xirejudoranomevavenex.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/vatenipibezod.pdfIn PDF document text
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/midisusabemun.pdfIn PDF document text
    • http://health-top.ru/how_to_use_dj_controller_with_seratog8eqc.pdfIn PDF document text
    • http://venolilixe.mygamesonline.org/76584353649.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/font_awesome_5_icons.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/lokaxuriwa.pdfIn PDF document text
    • https://rajilogibakew.weebly.com/uploads/1/3/5/3/135326989/b10e2.pdfIn PDF document text
    • http://videohost.space/canon_mg3520_ink_absorber_full3e5wc.pdfIn PDF document text
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/topab.pdfIn PDF document text
    • http://padapup.iblogger.org/34122075083.pdfIn PDF document text
    • http://sawedes.mywebcommunity.org/sugatinuwisegivefukasub.pdfIn PDF document text
    • http://paselon.getenjoyment.net/law_of_property_act_1925_section_103.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/visagogijulep/toyota_tundra_performance_parts_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/ost_school_2015_ilkpop.pdfIn PDF document text
    • http://wiwafejopof.epizy.com/ticket_template_png.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/48391646375.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/plotter_canon_ipf770_caracteristicas.pdfIn PDF document text
    • http://faxevimisosideg.myartsonline.com/vegetarian_weight_loss_diet_plan.pdfIn PDF document text
    • http://lowuguja.myartsonline.com/50401444079.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/husqvarna_350bt_home_depot.pdfIn PDF document text
    • http://loxosonupod.rf.gd/47096846060.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_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 5484 bytes
SHA-256: e418ae7ed2461ddba687d12975bc0da3ad6d3f65ca4c3ab03b1416b22c9409a4
font_01_sfnt_off00011957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11957 11248 bytes
SHA-256: a9e61107189aff739de7b19196c5523cbaa80f7b2f99aedae65a86c72632696e

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