Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b93a979ea35553a…

MALICIOUS

PDF

104.2 KB Created: 2021-04-30 11:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e1dc1e44e4a6b1bcc289cee0b47e7f0b SHA-1: ae6e6a1fda4deecd8ff7a75c6cdcbb3b620f0319 SHA-256: 7b93a979ea35553a7e637d96fee1230ff3828e7ac41d70f0f9dcb4a47316b5de
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on directing users to a link farm hosted on vilenefex.ru. This URL is presented with a 'feminine wordpress themes for blogs' query parameter, suggesting a social engineering lure. The PDF's structure and the high ML score indicate malicious intent, likely to drive traffic to malicious sites or potentially deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://vilenefex.ru/strik?utm_term=feminine+wordpress+themes+for+blogs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417325/normal_5fcd182042ea6.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/surface_area_of_different_shapes.pdfIn PDF document text
    • http://palopej.sportsontheweb.net/nirizaneg.pdfIn PDF document text
    • http://gofidiva.iblogger.org/cpm_ebooks_cc_geometry_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_602689f67b567.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://s3.amazonaws.com/sulasatevirexo/gexitefi.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_7140390a0a5d4430bde60929994edf8b.pdf?index=trueIn PDF document text
    • http://jiwodiw.myartsonline.com/5581058323.pdfIn PDF document text
    • http://zalezir.epizy.com/6886185978.pdfIn PDF document text
    • http://duziroro.myartsonline.com/the_care_and_keeping_of_you_2_table_of_contents.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/56776706086.pdfIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_ce94cdb7af90425595f864f9a378b170.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_7777b683c6f14f9784735c58bcb26f1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f37a50e0-211f-48b0-b2e0-acc0ea66831f/how_to_repair_radiator_fan_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10dc7988-858a-4ea5-8b28-8c2550c7708b/i_wanna_iguana_art_activity.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/cavaleiros_do_zodiaco_omega_legendado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144a359a-30fe-4572-be1d-e3915c40defa/thermador_double_oven_error_code_e218.pdfIn PDF document text
    • http://jeneviwa.epizy.com/bobesuzazumizebep.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_d7b8cd3761c7401b8c7692014e1b4228.pdf?index=trueIn PDF document text
    • http://puvewidu.epizy.com/91297374445.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_179fd46317b84a1eadb3e83a026e559c.pdf?index=trueIn PDF document text
    • http://wigewedarigal.rf.gd/playing_card_game_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232eb767-a0b1-424c-96bd-082731412037/tawufalep.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_off00014cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF2 5220 bytes
SHA-256: 5159a5857cf58497f28c907abaaa720ef6f9a122e2531b8746d263d807a3b4e5
font_01_sfnt_off00015e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E96 11384 bytes
SHA-256: fed0ad673d504a1de070dd4c065df668304d7f6677d4713deea826cbe934cf74
font_02_sfnt_off000184fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184FD 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71