Malicious PDF — malware analysis report

Static analysis result for SHA-256 df530de05740e2c0…

MALICIOUS

PDF

79.1 KB Created: 2021-05-22 22:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8135f937055f883c7ca577559f2587bc SHA-1: 3e66914b6d969589a82aa94afa3854e690c7c3d2 SHA-256: df530de05740e2c0a37623c180a38fe78cd01fc9f7a1b9482493714ce170f2c1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF link farm', with the primary URL being a phishing-related domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=how+to+write+a+summary+of+a+textbook+chapter+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385413/normal_60662ffb62b68.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/9eb9f014c80fb9.pdfIn PDF document text
    • https://fekawuzode.weebly.com/uploads/1/3/5/9/135993312/tupum.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/novuwofa_lunaled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390097/normal_604986667878e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_603cc8f0b1ba1.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/jolefejidezeramuw.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/d3d529d6-396c-4ef0-97b0-eb0632e39d53/19985031443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8662ae0f-ee0e-4871-a649-2e2b3e003ae0/dominos_garlic_white_sauce_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6423c83a-4ca2-418a-8cb3-e5042101670b/lanufixid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09413ff0-ed92-4768-86dd-6f6fd43b59f1/nagaviwekopixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848a6f96-98e5-4de2-9738-ac597691b1bb/can_i_make_an_appointment_at_nc_dmv_for_real_id.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18d1148-acc6-4ef1-a5c1-5f74949b3e5e/how_to_read_body_language_lying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25eddb6-20d7-4b87-bdf1-03fee16c029a/did_you_get_it_practica_de_gramatica_level_1_pp._97-98.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f6f35a-d4f9-425b-bb3a-0ba934364888/wupejusapefinepaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8fb003-0551-4bdc-b0e5-a54f442e20d8/regamiwokuvemataxasivafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bdcada-4abc-483c-9cb3-cf9ca78ccf6b/is_there_a_dog_man_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dfd45d-7eb9-45fe-8fcc-f65ca89f8c00/how_to_write_a_report_in_an_organisation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fcd4ed6-1488-4244-867a-6abcb138c9d0/does_holo_end_up_with_lawrence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1219ec-61ab-4ad2-853b-515fba2a3c76/what_are_strengths_and_weaknesses_of_the_articles_of_confederation.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_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 5460 bytes
SHA-256: 1bc88dcfebad79d2267b9a2fd38ce2911532bdeff79a29ef6224bc60683955b8
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 11196 bytes
SHA-256: 8ed332eb09ab0b625f20f9f3b0693c5b919da4e9ac713c29a82ca84b0c09b65f
font_02_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2