Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3a6268c6737fb6…

MALICIOUS

PDF

104.1 KB Created: 2021-05-10 04:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2f58523ef73543342d77173a5e97ab61 SHA-1: 41df3656b0f6daa4992b1d42df701492a499f949 SHA-256: ae3a6268c6737fb635204d2b806d60f445cbfb42a63de23d8cd7fafe2d0a1aad
256 Risk Score

Malware Insights

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

This PDF document exhibits multiple critical heuristics indicating malicious intent, including a recovery secret lure and a browser extension installation lure. The presence of numerous external links, including a link farm, suggests a phishing or credential harvesting campaign. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest it's designed to exploit users through social engineering, likely leading to credential theft or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://kuzutuzo.ru/strik?utm_term=my+cloud+home+local+dashboard PDF link annotation
    • https://cdn.sqhk.co/wekaradukuve/ihRfYgf/nofogugewonom.pdfIn PDF document text
    • https://tipipiteker.weebly.com/uploads/1/3/0/7/130775441/2472064.pdfIn PDF document text
    • https://damaxebibotewud.weebly.com/uploads/1/3/2/6/132682848/7634701.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/Ahdjhji/93548699314.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaku/ggaPw2l/snappad_eq_octagon.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/hchgsjX/2948092603.pdfIn PDF document text
    • https://rubebukani.weebly.com/uploads/1/3/0/7/130740450/e48484e3d.pdfIn PDF document text
    • https://bujakisuka.weebly.com/uploads/1/3/2/6/132695398/b3ad73c95eb5.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/limeman.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/lezibuvisaxilus-nonetadesirinub-degemibukujixen-katuzudur.pdfIn PDF document text
    • https://pebarefilegiz.weebly.com/uploads/1/3/5/3/135325086/272265382fef5.pdfIn PDF document text
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/4c025af57.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/363045ca5d.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/kumasala/zegidutufibovemafimu.pdfIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_11180402a7e141f49fd379cce816673b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/fts_answer_key_13_october_2019.pdfIn PDF document text
    • https://c38d9960-f3a4-46a0-b266-cfc7836dd0ed.filesusr.com/ugd/a8d9c8_a981426c912e4d16b5b3d27e3440ea92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mavixu/job_application_format_word_doc.pdfIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_2e3522d773eb4459bf38ce7e5e9b9ebc.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_8b682467d68646e4bbcad4ac81068099.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/popilo/definicion_de_enfermedad_cronica_segun_autores.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/gunejilet.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/dibixotabaligi.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/20343840739.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/amnesty_scheme_form_2019.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_off0001551c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551C 5428 bytes
SHA-256: ce9a8bb32f30697f090c40a792eabde93f73a23432a500b33d42fc033eba4e6a
font_01_sfnt_off0001676c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676C 12824 bytes
SHA-256: fb82041b9a45122ef887b87da184925f67a7bc63417c9a7c525cb5ba1839cc01

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