Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ce708118516ef8…

MALICIOUS

PDF

89.1 KB Created: 2021-04-16 21:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2bef8603be9e48ccee2e0285ee3bcbb9 SHA-1: db5e0090cf537ee9f42acda2477968660303bab8 SHA-256: 77ce708118516ef89bede92930ffab34e73d0c5502b323f03c877d3bda2e23a9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and configured as a link farm, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=do+element+tvs+have+bluetooth PDF link annotation
    • http://zutolewe.mywebcommunity.org/ncert_9th_class_math_book_download.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/computer_interview_questions_and_answers.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/5th_grade_math_worksheets_download.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/salezeromoxiji.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/xevawanapeniveles.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/dokoged.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/12164569538.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/oliguria_anuria.pdfIn PDF document text
    • http://majovevalaji.sportsontheweb.net/begum_rokeya_university_admission_circular_2020_19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_d7f25bfad9cd4f439a52aa6ae6fc1b9f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f097dd51-e2f1-457f-8271-995243962997/best_free_online_guitar_lessons_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/avast_gratis_italiano_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/waterpik_cordless_plus_water_flosser_wp-450uk_charger.pdfIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/47849620911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19e1c2a-a8af-48d4-9fd3-8fe708f124c3/39756619148.pdfIn PDF document text
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_0c71ea83ab8d4ed1ae160bef1d7e9d07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a741017-7f10-436a-b744-2bcc5e1af2a3/gurefupobaxigokinufamavu.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/essay_writing_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/fipavagopuduti.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_c67702a8212240bd92c11e921d8e2177.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/70105567947.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 5028 bytes
SHA-256: 3f29a525a329b47bd3ce079b49181449d1197f6cf84f8ea26a4b0a051ff1499c
font_01_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 2344 bytes
SHA-256: ba05d8f0ede1cd454592930c2236be597200cbd5df0bd770a2555f786df67bc2
font_02_sfnt_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 11768 bytes
SHA-256: 876748873ee87ffb0d57deb3f8c75c137908e94d574d8608357b8a26947d36c1

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