Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8150629cef5092…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 18:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28c14c3257e04ac69d419502d3365723 SHA-1: 235c9a663e62f3ca28378fb686f813a503dc3272 SHA-256: ba8150629cef5092d43c500bfdf57baff78060a4dc0b307ecf1b8bd92a773457
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. Heuristics suggest this is an image-only document used as a lure, typical of phishing campaigns. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a first-stage downloader or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=ds3+weight+calculator PDF link annotation
    • https://www.weboonline.com/ckfinder/userfiles/files/12392891614.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/48882432428.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/tojepakolimovojanile.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/refapemukevabejejere.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/sijogepiwirosoxubozumuten.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/timotasolizejipav.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/dedalupijexitabike.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/18295386232.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/56569395659.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/fifebiperegokijuvobeburar.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1150d6d32---wulefodelenikar.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-11/20210911220052839075.pdfIn PDF document text
    • https://durimawar.com/contents/files/77900462233.pdfIn PDF document text
    • http://cl-pub.com/files/files/nosoma.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/93711746148.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/tagagikaligosulubitineno.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/paguvomorevoxuwobu.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/49679744336.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/jovilatekesudumetot.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/90567606364.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/bomenekixo.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/kukor.pdfIn PDF document text
    • https://rosycaffe.com/file/lapafaganobosawulidisaxud.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/berurakakula.pdfIn PDF document text
    • http://guowangcable.com/d/files/39790805210.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29D 13984 bytes
SHA-256: ee1ebd205e65017b0ef53e728d029c428b2338d281563de9dd1cdd7bd00a7b25
font_01_sfnt_off0000d539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD539 10764 bytes
SHA-256: 288813382158fd08dbcc2db7c235f681a677199b4837a7a18c7227718f84d427
font_02_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1