Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dad564c8a93647…

MALICIOUS

PDF

75.8 KB Created: 2021-06-06 01:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a824e1ca5d25f229db7e836f028eda8e SHA-1: c246d18ff1bc2375604bf6680ed504745b9e9c13 SHA-256: 39dad564c8a93647a40daf83d4765b1b3a2d2cd4ed53383c86a70140d694db00
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 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.
  • 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=flow+chart+excel+templates PDF link annotation
    • https://womurozini.weebly.com/uploads/1/3/4/5/134507066/dalebudu.pdfIn PDF document text
    • https://zizolewezefid.weebly.com/uploads/1/3/4/7/134702939/wobemix.pdfIn PDF document text
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/fumowajazivezej-suleweve-matixepi-vitusu.pdfIn PDF document text
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/topida.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/visalimavixudi_wofiwibivegas.pdfIn PDF document text
    • https://rupekiduwixe.weebly.com/uploads/1/3/4/7/134774185/japatid_gukisobonok.pdfIn PDF document text
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/d42ddb1b817910.pdfIn PDF document text
    • https://dupukaradox.weebly.com/uploads/1/3/6/0/136015529/bisut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ludagobef.pbworks.com/w/file/fetch/144553527/86446021221.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144420390/76751295618.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144502389/asi_se_dice_level_2_workbook_answers_3.8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78cb881a-d44c-4584-aa0a-7348b1bfa334/what_is_the_latest_news_now_in_israel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74a5eea-233b-43f2-8ac0-80cc338a4b75/how_to_start_a_stihl_ms_230.pdfIn PDF document text
    • http://dagomiwavi.pbworks.com/f/49054548586.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144418773/83143598251.pdfIn PDF document text
    • http://duriwug.pbworks.com/w/file/fetch/144614454/jeepers_creepers_2_english_full_movie_download.pdfIn PDF document text
    • http://nugewil.pbworks.com/w/file/fetch/144611775/how_do_you_change_the_battery_in_a_timex_ironman_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db760ef2-fbe2-4ab1-87be-edd959cb7f0e/cuanto_mide_el_metropolitano.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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 5288 bytes
SHA-256: 259d6c23abd7e8b344b9604359dd0d7af6a9df2014c3807501a2bb543ce06e36
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 10304 bytes
SHA-256: e98a81cf291150dceab68b400ea4f77c4fdf478dd4c46bdcb39e8f40abe68f4b

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