Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b80051f42810ac…

MALICIOUS

PDF

72.8 KB Created: 2021-05-12 13:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ac1f98c6e4a04dd2ad4eed3d48bf9418 SHA-1: 57ada8da9b2eb479ffa3558cd2db3eff71668fd3 SHA-256: c9b80051f42810ac9eedfab980c74fe69602da4b108a54553d2139d3a13cb326
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links, some on disposable hosting, suggests a link farm or phishing lure designed to direct users to malicious content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+do+you+use+a+schumacher+battery+charger+starter In PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/ijgjgf7/final_fantasy_7_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/ehd7Sgc/best_music_player_for_linux_mint.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/eyLiiie/fill_in_3d_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujagemo/uXgihfW/adjective_order_worksheet_esl.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/ZIicRdI/84338564717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womidelere.myartsonline.com/free_mechanical_aptitude_test_with_answers.pdfIn PDF document text
    • http://jewalozuda.rf.gd/xuvunazifix.pdfIn PDF document text
    • http://maviwapas.epizy.com/10553682106.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/luvubogijululomemise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9c14ce-c650-4786-9874-90d289514165/spanish_dictionary_imperfect_conjugation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5784bc1d-05cd-4c4a-b1c8-0299791bd3d3/visual_basic_dot_net_2008_free_download_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/golden_slumbers_sheet_music_free.pdfIn PDF document text
    • http://tufelurokid.epizy.com/votugamofidas.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/python_language_in_tamil.pdfIn PDF document text
    • http://zowepew.rf.gd/beethoven_9_symphony.pdfIn PDF document text
    • http://nowuvilopenibe.rf.gd/the_camellia_girl_full_movie_eng_sub.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_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 5616 bytes
SHA-256: b82738c9bd9ce33290374cee38c81ef015d67e95bf456544bb27f22caef19ea2
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 10584 bytes
SHA-256: d8563436b2201121d3a11e29f29d9ec595de6d27cbb63b8b57090e91e83ddb5e

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