Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1cac3af3f85e36…

MALICIOUS

PDF

85.1 KB Created: 2021-04-19 21:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 11a109e0e65e290ecbcbc2ca9cde8681 SHA-1: b2a12940e2c6192a977fc08c534c50efe0a34c88 SHA-256: 7c1cac3af3f85e36b371298f21c7953fed544550b9146ed7f8449f0344bdda2e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, specifically to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jumiwimov.ru/strik?utm_term=harley+davidson+maintenance+schedule+checklist PDF link annotation
    • http://astrology-personal.online/xipimixujosisopenle7k.pdfIn PDF document text
    • http://igcopyrightclient.com/60235162286z3fpn.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/maven_tutorial_udemy.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/rotoduromowofogimotopuxo.pdfIn PDF document text
    • http://icub.tech/80128412504kxmy.pdfIn PDF document text
    • http://topsalon.xyz/daniel_fast_meal_plan_20190vdkn.pdfIn PDF document text
    • http://grantmedica.ru/jowitigisubixoduji50qk0.pdfIn PDF document text
    • http://supportcopyright.net/kusalopudojojiomw2u.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/how_to_change_a_snowblower_augerdqrlo.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/isometric_dot_grid.pdfIn PDF document text
    • http://vuvabadiredowa.getenjoyment.net/acetylcholinesterase_inhibitors_mechanism_of_action.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/mojonikoborula.pdfIn PDF document text
    • http://wubowobipevoto.mywebcommunity.org/suite_bergamasque_clair_de_lune_sheet_music.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/makadawofupigiruwefuduvcyil.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/scientific_classification_of_banana.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
    • https://s3.amazonaws.com/jajuzasalikirut/56607814376.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/application_letter_for_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/fenigak.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/what_are_the_elements_of_form_in_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/easy_worksheets_for_esl_beginners.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/81168795689.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 5248 bytes
SHA-256: 4698c1390ded7887221d64453e193a5670d360cd8314aa89b0de839f1c20f343
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 11700 bytes
SHA-256: 876dd30f19c9412ecebb97b8fbbf714aea2b672963db4844d3bbc84c362efc07
font_03_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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