Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac2997ef7020446…

MALICIOUS

PDF

110.6 KB Created: 2021-06-01 20:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b0ac4cb118173fc3b5affaacb0ca3c3 SHA-1: c71bbe50c9413aed4b4a1e26524d45761f3b103d SHA-256: 4ac2997ef70204461d760d61e8b74e49e1839e8a9df39bc09efdbbc557757f77
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://chcial.ru/pbw?utm_term=how+much+is+a+2000+e+pluribus+unum+one+dollar+coin+worth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449012/normal_600e88ef2cbeb.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/tugiseke.pdfIn PDF document text
    • https://sibanixo.weebly.com/uploads/1/3/1/3/131380297/62af57d16a008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506170/normal_6053c4566bf54.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/vejulewetad.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/e7e6a05488b20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495059/normal_5fd218ac8c5fa.pdfIn PDF document text
    • https://xuvuluvibes.weebly.com/uploads/1/3/4/4/134494650/3678cbf5c49b01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokopaviwu.pbworks.com/f/sistema_nervioso_periferico_estructura_y_funcion.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144420117/100_pics_answers_drink_logos.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/foxanepifedarixenotajeri.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/bahubali_2_hd_tamil_movie_download_tamilrockers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948d24aa-2c2a-4a86-8147-64a824eef90f/kefarolikitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9bf733-9226-438c-bb53-ac5d0d64ed1a/is_vegan_or_vegetarian_better_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8115794b-c029-4e0e-81a7-f32b801e6c0e/kindle_touch_instruction_manual.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/gelawuzudof.pdfIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144474039/disoxekaraxevalubawepola.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/exercice_groupe_sujet_verbe_ce1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c92e6d0c-79d8-4544-bb1c-176b3eb5e213/do_all_snap_on_tools_have_a_lifetime_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76e7036-10a8-4b0f-821c-1622154a4bdf/31489267192.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144413832/76217963152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a90af3-e44c-4eef-87ae-e7ee99a58c0f/casio_wave_ceptor_4303_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f43130-fd46-4185-b2e2-f5e892dea416/attack_on_titan_season_2_live_action_full_movie.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144452250/kadodavudifinuviresen.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_off0001594c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594C 5780 bytes
SHA-256: 3d6b4e87ea52b0a26aa1c2d4ba579d1fa211449a5eba3b995b4d085ded3259c1
font_01_sfnt_off00016cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD4 11716 bytes
SHA-256: 1a568591641f7f6e59494d4285cc3ec0b4218302c7df304e96e9373d5f0defe9
font_02_sfnt_off000194c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194C8 16176 bytes
SHA-256: 9f4914eee661b0ee52b7d56f83ca1c0c111f1c5d0cc5f10efe511803eb69212c