Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5395c20cd238579…

MALICIOUS

PDF

91.1 KB Created: 2021-03-28 22:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 001a521f1805e61fd367c6bb82cfc1b2 SHA-1: 10c667762e86a54ed8dd154adece7c8f53cd1d9a SHA-256: a5395c20cd23857980fdd67c66ecb3e85d048b3ede0d24ba37ec7b766560cb85
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9481

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
  • 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://xajibur.ru/award?keyword=alem+do+materialismo+espiritual+pdf PDF link annotation
    • https://rukifutotusiz.weebly.com/uploads/1/3/4/6/134685592/makole_durak_puwujuv.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/igii6EH/ocr_gcse_computer_science_programming_project_answers.pdfIn PDF document text
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/6762098.pdfIn PDF document text
    • http://funokeronox.iblogger.org/zubanuviv.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/RSheicG/farujavafinevofokopu.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/vakar.pdfIn PDF document text
    • http://retenenu.iblogger.org/zosoraxerakijezebulevesu.pdfIn PDF document text
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/1447274.pdfIn PDF document text
    • https://kutikeso.weebly.com/uploads/1/3/4/4/134490414/balepusaponini.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/jfhhZqc/5795377160.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/what_is_endosymbiotic_theory_definition.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/canavalia_ensiformis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lenofafezanobu.atwebpages.com/81447767980.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/michael_bazzell_books.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/bellavista_ventilator_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662463e5-98e2-4837-bc5c-a99418f7305e/fluval_305_filter_review.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/free_reading_comprehension_worksheets_for_esl_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1e1b2e-df45-4ca1-b70d-b3da7ef4b8b9/lubukijitozovafaxililapan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd3d7c8-609d-4359-8762-abd474ba7765/kojejelusezadigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e0d4633-7154-4ff7-a0fd-6c38a151b483/how_to_reset_rinnai_rl75.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/what_is_the_history_of_arts_and_crafts.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/acetate_film_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17275caf-ee76-4949-b803-12bc12294071/msi_970_gaming_mainboard_bios_update.pdfIn 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_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 5176 bytes
SHA-256: 934c96a3a6118fce018ce886f775bd8d2c62a39d1bc4c17b8131c5681382e929
font_01_sfnt_off00013eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFF 13088 bytes
SHA-256: 0e1433afc7e9c39cc58084f5479ee859d2fc7fbd46a59c3990bf1a10dd7a3718