Malicious PDF — malware analysis report

Static analysis result for SHA-256 a728d44d879c72e7…

MALICIOUS

PDF

106.5 KB Created: 2021-03-15 15:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a7885fab8368f38f165c6308efbc268e SHA-1: 39d78df312c84f7f844489a781c7f08f3755032a SHA-256: a728d44d879c72e783898566012cdf7f53920b4379dab55666c473332222cdec
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an external URI pointing to 'seumenha.ru', which is likely part of a phishing or malicious link farm operation. The PDF structure and embedded content suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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://seumenha.ru/wix?keyword=manual+lymph+drainage+therapy+neck PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380705/normal_60087b8c88393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fc842a176ba3.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/wazawexo.pdfIn PDF document text
    • https://puwexisafiza.weebly.com/uploads/1/3/4/5/134586360/gujuxilanip.pdfIn PDF document text
    • http://pubofumoxo.scienceontheweb.net/chemistry_notes_for_neet_exam.pdfIn PDF document text
    • https://gasezojilatinoj.weebly.com/uploads/1/3/1/4/131455825/pimefajaliwen.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/the_invisible_man_novel_summary.pdfIn PDF document text
    • https://weritesi.weebly.com/uploads/1/3/5/3/135314652/7379577.pdfIn PDF document text
    • https://suzazenesegi.weebly.com/uploads/1/3/0/7/130776168/povuxubigin.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/muwamiwibuwunuxepos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428062/normal_603aaafa9fbbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_600b3802d3342.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/584f1b816.pdfIn PDF document text
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/zusafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_5fea191ade9e4.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/accounting_business_management.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/2104a6e.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/love_language_test_for_couples_free.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
    • https://uploads.strikinglycdn.com/files/8d5df148-c5af-4798-8f96-c4a746de5552/geladuximepivowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480bf3ae-551f-46c3-8c4a-0bff6db4b4e8/gre_word_list_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac3c61d-f95e-4813-9df0-6ba69296e369/ipod_nano_3rd_generation_price_philippines.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/48993452813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e3ebcb-f505-4393-be61-f765a24e425e/what_is_sql_and_sql_plus.pdfIn PDF document text
    • http://miganuvag.myartsonline.com/how_to_find_density_from_pressure_and_temperature.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/how_do_i_put_my_maytag_washer_in_diagnostic_mode.pdfIn PDF document text
    • http://kagijido.myartsonline.com/61305295926.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F18 5252 bytes
SHA-256: e1b2014859c2e7a195ce9ed427550b8b9ffc6da85a992b0f9d0eb11ef8c05ec3
font_01_sfnt_off000150c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C6 11508 bytes
SHA-256: f4784b8550eeb6803909c69f9e83c7ecc5b6833715cf1673032c7da05cbdef64
font_02_sfnt_off00017825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17825 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00018d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D55 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34