Malicious PDF — malware analysis report

Static analysis result for SHA-256 3956730d9c111664…

MALICIOUS

PDF

77.2 KB Created: 2021-03-24 14:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 966dc3021fb8d9ad8951b2716ca4a26f SHA-1: c7c09d93a1119412a3bfd0f5dc9ced257145cf70 SHA-256: 3956730d9c111664c04b6c8fa838d5cec207e66b24df1dc1be41a620b6200cd1
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a lure for a fake download, indicated by the 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic and the embedded URL pointing to a redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://botokaw.ru/strik?utm_term=como+se+formula+un+problema+de+investigacion+pdf PDF link annotation
    • http://gufutaca6.xyz/pobiserirurnq06h.pdfIn PDF document text
    • http://mif-smeh.space/gedusitedisinalscjt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_602eed5f29d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_60526ff4dcdd8.pdfIn PDF document text
    • http://wide-take.top/bozilogogoxabivevuxobebuhc5qp.pdfIn PDF document text
    • http://bugiwuxad.medianewsonline.com/7913731584.pdfIn PDF document text
    • http://deemonatrafik.xyz/iso_27001_guidelinesv2jmz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443292/normal_5fee909f2de54.pdfIn PDF document text
    • http://tradestaroffice.com/stack_on_22_gun_security_cabinet_for_sale7yr0f.pdfIn PDF document text
    • http://bozigojinodebux.iblogger.org/live_stream_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_5fff6fff94e88.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/babbity_rabbity.pdfIn PDF document text
    • http://geloritiveda.mygamesonline.org/43982659794.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/bewibiwat/pitoneparizupewujivozi.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/singham_returns_movie_pagalworld._com.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/71638096567.pdfIn PDF document text
    • http://fukefuxatolu.epizy.com/lapodixuretutebozurusukiv.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/xobop.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/ayasaba_amagwala_eff_song.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/miledebalip.pdfIn PDF document text
    • http://wixixikaluzisis.epizy.com/samsung_galaxy_tab_a_sm-t350_8-inch_tablet_case.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/jiwin.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/kipeti.pdfIn PDF document text
    • http://dulasugemekiv.epizy.com/atkins_meal_plan_phase_1.pdfIn PDF document text
    • http://savefativiluz.epizy.com/brussels_tram_map.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/kaguvatawixufatalagi.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/cartello_vendesi.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_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5580 bytes
SHA-256: 3f3192bcfaf75a7cbc54b5023e6cfd0bf089d4d4c3a8e013f2f9b497534d95ce
font_01_sfnt_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 11864 bytes
SHA-256: 29022c6897f3f362f72f46c0b35276e34501b3b948e6d763a4f69bcddcfd0061

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