Malicious PDF — malware analysis report

Static analysis result for SHA-256 715f399b8e86fc5f…

MALICIOUS

PDF

76.5 KB Created: 2021-02-26 04:31:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fc7a21def1402dab81647e4cf4a2b2b9 SHA-1: ae0ed1695aec04307e4f4aa3322680e39908aaec SHA-256: 715f399b8e86fc5f0d4d29827680b5868ce020137512a05c9bbc38deb8e5bc31
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The primary attack pattern involves leveraging a link farm to distribute potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=mechanical+engineering+science+textbook+pdf PDF link annotation
    • http://italysummer.space/zigezad6l5is.pdfIn PDF document text
    • http://springital.fun/ap_english_literature_and_composition_2020_rubricjpku3.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/255cb802f30.pdfIn PDF document text
    • http://armlur.space/gangster_new_crime_mafia_vegas_city_game_downloadqgjh7.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/dGii3ji/turugepegagiminot.pdfIn PDF document text
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/juvowiputonoko-savazegenom-fitofiborus.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/fqhdgcV/81089977928.pdfIn PDF document text
    • https://cdn.sqhk.co/tigoxexuda/x8Lghhj/samsung_j7_prime_gallery_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/fkkihhe/race_against_time_ben_10_full_movie.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwomonemagup.epizy.com/metropolitan_police_report_a_hit_and_run.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/14470295784.pdfIn PDF document text
    • http://kuxemozoxabonag.onlinewebshop.net/manual_of_the_planes_1e.pdfIn PDF document text
    • http://zipoxibel.epizy.com/dslreports_speedtest_cli.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/the_veil_movie_in_hindi_download_300mb.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/63107270396.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_off0000eca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 5692 bytes
SHA-256: 7b6d8b0ae7bc7c446a6c439d825c8db9491ef72ba217d838d9673737f1c96c77
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 10836 bytes
SHA-256: d0840cef4579db78c081f2d80d36ca4362f89af776415ad249cc4c7d16e5e373

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