Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6187bed88cf7ed2…

MALICIOUS

PDF

93.4 KB Created: 2021-06-04 12:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4febd70b8f3c0bbab384eeeb9d44b1c4 SHA-1: 235d028d35468b4f7e9b21228d6945154b5db981 SHA-256: a6187bed88cf7ed2ac373b0f33f7750c010f199169512e5a9518fb3422c44077
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, with one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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 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://krisoc.ru/pbw?utm_term=ejercicios+gerundio+e+infinitivo+ingles+3+eso+pdf PDF link annotation
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/1808690.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/xesinuvire_pofifobofewaruf.pdfIn PDF document text
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/xobikomoxaj_kerizow_paxipibevijukop.pdfIn PDF document text
    • https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/vexatu-femejuzoxirel-keparaxadi-tovadobur.pdfIn PDF document text
    • https://sewolisexuvafu.weebly.com/uploads/1/3/2/8/132815731/d9d1349942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojaweku.pbworks.com/f/why_is_my_modem_blinking_red.pdfIn PDF document text
    • http://kunixove.pbworks.com/f/pdftraditional_approaches_to_the_study_of_comparative_politics.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144476259/44192979997.pdfIn PDF document text
    • http://wuwazilizos.pbworks.com/w/file/fetch/144425859/noretakikinaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca57074-d308-47ca-a868-95ac6ec9c8a1/tigefiwigogas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cceaaf8-8a4d-47c9-ae75-d3ef7b42d6c9/innova_3020b_code_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c4ae51-b8b9-40b6-af12-461004b19659/strategic_marketing_plan_template_word.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144442248/can_you_make_tags_on_a_cricut_machine.pdfIn PDF document text
    • http://funesut.pbworks.com/f/365_mandalas_para_colorear.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/zororasinoxawajet.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/junior_software_developer_technical_interview_questions_and_answers.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/f/12992073708.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/f/orcad_pspice_a_d_reference_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c57ff6-1121-41ea-a58d-1e85dc148104/how_to_open_sentry_safe_with_key_only.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/26128594221.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/24619308374.pdfIn PDF document text
    • http://mizunebapod.pbworks.com/f/what_is_proof_of_concept_with_example.pdfIn PDF document text
    • http://madatev.pbworks.com/f/luwipugujesamulixevoma.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/f/37994930323.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
    • 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_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 5368 bytes
SHA-256: 92772feaeca843eedc8b9ffc96a0ae0ca9d877de8baf1c6f82db44589e030f23
font_01_sfnt_off0001261b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 12780 bytes
SHA-256: b5c30e2d8986c7ab8dfffa631da9521e796de5fb72cf8ab697ba8725689a0959
font_02_sfnt_off0001502d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502D 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0