Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8588340883bdf1a…

MALICIOUS

PDF

74.2 KB Created: 2021-02-23 23:38:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e24daf151887524c445e87edc914680f SHA-1: 8d47578bbedaf567763e459d796b8333fa4e3abb SHA-256: f8588340883bdf1a95244f602f1b5e6ed2ae9776e424258770720ca8c42322bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=minecraft+essential+handbook+read+online PDF link annotation
    • http://idealicaitaly-ufficiale.site/sumonawitanifigiwedozlp9n9.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/1PgfVoI/penokositeparozi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_60153c2a212d7.pdfIn PDF document text
    • http://dress-russia.ru/82139611321c8qsm.pdfIn PDF document text
    • https://cdn.sqhk.co/bezupidokaz/KOYjjhy/pomanunikij.pdfIn PDF document text
    • http://witogitozukifon.iblogger.org/camera_powerpoint_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/6anfELY/wopemawosenar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fe4275c88afb.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/hcjeIic/war_of_spells_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/jiejeig/vodefokatezarugegewiwi.pdfIn PDF document text
    • http://intereriia.com/irish_independent_gaa_match_reportspluu9.pdfIn PDF document text
    • http://rujajabejeveto.66ghz.com/belajar_excel_dasar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jebejabekuja.epizy.com/why_does_my_projector_have_no_signal.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/my_talking_tom_apk_mod_unlimited_coins.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/7171019897.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/petewevulozomexi.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/638008563.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/60630551687.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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 5108 bytes
SHA-256: 3669fdc17c8514a9b9cfa00abecb2893dce497982dfbb5848871c047d05814bc
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 9648 bytes
SHA-256: ce3e52404b1dfa683da465bc4c42cc444dd2479d0fbdb3deefff958f8f4811cb
font_02_sfnt_off00010d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D23 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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