Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a980d7e9cd4581f…

MALICIOUS

PDF

80.7 KB Created: 2021-04-11 18:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7540473017018f2c076e1e2736cc6170 SHA-1: 99a2bd195c23ed4ecf163af2aaba629fef891ac0 SHA-256: 8a980d7e9cd4581f8e3071160c991095238feda20a913962db5c9afee097bbaf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the document's purpose is to redirect users to potentially malicious sites for phishing or malware delivery. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://botokaw.ru/strik?utm_term=serta+motion+essentials+adjustable+base+king PDF link annotation
    • http://xepuxesadara.mypressonline.com/programming_languages.pdfIn PDF document text
    • http://urolog.xyz/break_the_glass_game_friv3okdc.pdfIn PDF document text
    • http://tonagruz.ru/lefebuxupupost6og7.pdfIn PDF document text
    • http://heartcenteredequestrian.com/play_free_games_online_without_ing_gtafo6oh.pdfIn PDF document text
    • http://woradegasuma.iblogger.org/nh_t_icloud_v_iphone.pdfIn PDF document text
    • http://pitepon.22web.org/c_programming_tutorials_free_download_sinhala.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/buku_sejarah_dinasti_abbasiyahnmepy.pdfIn PDF document text
    • http://idem-peshkom.ru/jaretezesoz5mxy0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_a7df45bd7b2e4f5cbf7af25cb0eb62c4.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_2ea7cc86bfdf493f827903920ce4f02b.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_6a57113dd61f4d20abf17474da7bf194.pdf?index=trueIn PDF document text
    • http://tigaxulajaju.epizy.com/sheetz_allergen_information.pdfIn PDF document text
    • http://zokugapifixi.rf.gd/vawobe.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_6a5f2b3f81f2491080cdfee2c1cb83fb.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_00da3a9eabd04947be1464f6718c4c55.pdf?index=trueIn PDF document text
    • http://seroritubofa.atwebpages.com/astm_a105_13.pdfIn PDF document text
    • http://rovosaba.rf.gd/what_are_the_elements_of_design_in_fashion.pdfIn PDF document text
    • http://bokakemipik.epizy.com/kiguj.pdfIn PDF document text
    • http://rewejuvozotu.epizy.com/conjugate_french_er_verbs_worksheet.pdfIn PDF document text
    • http://kisepupiregeseb.rf.gd/green_smoothie_diet_plan.pdfIn PDF document text
    • http://piwapikefiraxi.rf.gd/dobegij.pdfIn PDF document text
    • http://gaderaxanaru.epizy.com/xudofiwunixatisasesoga.pdfIn PDF document text
    • http://jakezijaredu.epizy.com/59720020170.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 5528 bytes
SHA-256: f2ac5a4ef1a9261257325bbfe3c3155df7ad944cf6ecb069c04563470624f85c
font_01_sfnt_off0000f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 11316 bytes
SHA-256: 853b66ecfacb659b0501ead3ef57a4a06be6c18a8c0c31d32b131b6c2cb64c51
font_02_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 16312 bytes
SHA-256: 4dd54476baea8e95977730749914ee2a5f1a6ccb58adbad06d5dc92bdd54ca55