Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7fd2c8a2ee4b752…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 22:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a483af0178cc9b8c412f68ac727d00b SHA-1: ac80756729fbb66c0a7fcf626e589bd767ac2eea SHA-256: e7fd2c8a2ee4b75298de301048164b8ba8c94bc3bd11e5f11fd9e28e2e6d8e90
174 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript and numerous external links, many of which point to disposable domains and are algorithmically generated. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript and external URLs are indicative of attempts to execute malicious code or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=easy+catch+pokemon+emerald PDF link annotation
    • https://cartolmania.it/file/zadapeze.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/34648883057.pdfIn PDF document text
    • https://blugarden.eu/file/lemomuzokanenedanekov.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/nebulajojumorexa.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/jodetuzubemuseji.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/bepexiwakudofed.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/sasumoxopixebonov.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/91721926193.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/54232874239.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/78226225180.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/puralajowoxodujapezimebo.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/lebatesuxevubebufip.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/55004042286.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135959e2c127---ruwamumodaxasopaxefidu.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/worodupabudin.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/wibujuwezoguxekelukaza.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/55994792973.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/97262020048.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/sosozuverotageraj.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/22696254194.pdfIn PDF document text
    • https://felicityokolo.com/file/66653249749.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/zorepuvenivapuxitubel.pdfIn PDF document text
    • https://ambalatender.com/upload/files/lawejudatexunijewekevuxo.pdfIn PDF document text
    • http://skupka23.ru/upload/m/mixobazuwabegusojumedur.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/lutebuxivezesisa.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/14985931088.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_off0000b174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 14916 bytes
SHA-256: e571d35ce644980e289da6d03e779e2f3121cacead68c4feea8dd92a3792cce4
font_02_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10876 bytes
SHA-256: 13758c8940796e202baaba3417efc783c5f189a4e53035837b836fcd956ab4db