Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a08e21d88d5897d…

MALICIOUS

PDF

81.1 KB Created: 2021-04-29 17:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 166dc61933ab7e1f2476a464d7240ecb SHA-1: a2a70f008160e1be2e0763407af68810efeedab7 SHA-256: 8a08e21d88d5897d4c8d7e7303910977f679ed135509288058d0328e1b6f9040
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to mimic a search query, suggesting a lure to trick users into clicking the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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+i+reset+my+samsung+top+loader+washing+machine In PDF document text
    • https://tebukebodo.weebly.com/uploads/1/3/1/3/131381901/385337.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/idsihid/gageminaxemixe.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/average_salary_for_entry_level_business_analyst.pdfIn PDF document text
    • http://muvepifare.mygamesonline.org/no_excuses_book_brian_tracy.pdfIn PDF document text
    • https://rawavofim.weebly.com/uploads/1/3/1/4/131452817/komovejugoferawos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490516/normal_601594425f165.pdfIn PDF document text
    • http://xuzokunomiba.iblogger.org/tardiness_theory.pdfIn PDF document text
    • http://bixifofagowezi.22web.org/dasozipitakedavovuret.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/lumuzinas.pdfIn PDF document text
    • https://gobezovix.weebly.com/uploads/1/3/1/4/131454522/62a900ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_60180edc252c9.pdfIn PDF document text
    • http://bepedegikojafeb.22web.org/creative_writing_a_beginner_s_manual_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rafukilus/hbDjjzq/entrepreneurship_books.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/eac18.pdfIn PDF document text
    • http://lurobur.iblogger.org/behringer_x32_manual_de_usuario_en_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/ijphea9/bein_sports_subscription_usa_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/jaDhjLY/voloco_auto_voice_tune_harmony_apk_mod.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
    • http://nujedanamepo.rf.gd/how_to_connect_dell_wireless_mouse_to_laptop_without_usb_receiver.pdfIn PDF document text
    • http://pasifowon.atwebpages.com/47644644098.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 5524 bytes
SHA-256: 6a41f18eeea06a56ba7db383f7d0bb0e5e044351f30a6d6dae1f9c427d612260
font_01_sfnt_off000100dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 11272 bytes
SHA-256: 0004983369057f57fa8d88a31bd058056e080006836f01ff4bd6318fe6eaa5ac
font_02_sfnt_off000126f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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