Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb08d803cae1f091…

MALICIOUS

PDF

116.9 KB Created: 2021-02-25 04:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 81a444dc7ff4b72a72774359bb2bd421 SHA-1: acd60608142289c1ab6fa8a06735ec752f7981e8 SHA-256: eb08d803cae1f09116518b6562085da8f2a26252464d6833a73ff36745e426f9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically appearing to be a redirector for a search query related to 'black and decker cordless drill 12v battery'. This suggests a phishing or malware distribution lure. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=black+and+decker+cordless+drill+12v+battery PDF link annotation
    • http://interplast.ru/mr_answer_please_pickup_the_phone8crdf.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/dalivudixosinunex.pdfIn PDF document text
    • http://safetymirrors.xyz/mujawunudimozolemomnrnoj.pdfIn PDF document text
    • http://erse.xyz/tomizokiziraswe6j8.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/basic_english_worksheets_for_spanish_speakers.pdfIn PDF document text
    • http://nupubidodeje.22web.org/true_to_the_game_2_movie_release_date_amazon_prime.pdfIn PDF document text
    • http://gobuweba.22web.org/pembelajaran_behaviorisme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fd26ba781292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501041/normal_601b57db22eff.pdfIn PDF document text
    • http://ita-fitness.fun/free_online_european_history_textbookrrn6y.pdfIn PDF document text
    • http://doordash.fun/quantum_mechanics_500_problems_withncrli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilepobafomunow.atwebpages.com/22881538564.pdfIn PDF document text
    • http://sutexuvidag.myartsonline.com/is_eso_worth_it_2020.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/roomba_560_manuale_italiano.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/pewulumugabokapaga.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/como_fazer_um_convite_de_aniversrio_digital.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/photive_s10_bluetooth_speaker_review.pdfIn PDF document text
    • http://vaxuraribo.rf.gd/vopewusunoremotukaki.pdfIn PDF document text
    • http://lulikeleweworup.epizy.com/live_aus_tv_apk.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_off00018c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C2B 5532 bytes
SHA-256: 7f39851a86dd4203fe6544b701be2ef3e4599549d2dc15c1bd820053b5443714
font_01_sfnt_off00019f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F1B 10956 bytes
SHA-256: 24ff3094a0bd91e47c7d405e205ce7566f6071063510d53a7b940114b3eb8401

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