Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7f3ba73fe2a22c…

MALICIOUS

PDF

78.2 KB Created: 2021-04-06 09:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 82498a42f3e328aca2439e9e9af09ac3 SHA-1: 98e55f631c3b6f512d7b277f7cb42ad2ad7d5c5e SHA-256: 5d7f3ba73fe2a22cfb4d19957a4d714dc40d75e82d5adab860b1995a7466cfb7
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, embedding numerous URLs under the guise of providing information about "high performance aircraft definition". The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of external links, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/123?utm_term=high+performance+aircraft+definition PDF link annotation
    • https://cdn.sqhk.co/nokulebepoba/Iibhhl2/usher_songs_youtube_yeah.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/4GTjfgj/bandi_sanjay_munnuru_kapu.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/reduce_size_acrobat_pro.pdfIn PDF document text
    • https://kominuxopexazi.weebly.com/uploads/1/3/0/8/130814675/1382275.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/fPAMvkP/kumuxorika.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/93icTgf/dinosaur_t_rex_sound_download.pdfIn PDF document text
    • https://sokotomajav.weebly.com/uploads/1/3/4/0/134040389/ruzumob.pdfIn PDF document text
    • https://kivojiwivumupu.weebly.com/uploads/1/3/4/5/134597008/fa8b9c15de.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/qibYhgr/percentage_calculator_between_two_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/Kgfjghc/84827372052.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/oR0RgiA/pubejebelegoparege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09d1dc3a-5275-4ba2-8a8f-91221c7d6bf6/sc_drivers_license_real_id.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c7fe85b-983a-4ca6-a06e-8e23f6192dcb/maserati_quattroporte_2020_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f538e7cd-3794-457a-ab0a-0f0d4fa76d5b/buredatat.pdfIn PDF document text
    • http://tereralubo.epizy.com/how_to_reset_dsc_security_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00ef2ef-0b4d-4a32-9e69-ec20e18d2c58/67630465719.pdfIn PDF document text
    • http://kepewitibafef.myartsonline.com/cambridge_advanced_learner_s_dictionary_9th_edition_free_download.pdfIn PDF document text
    • http://susugafof.epizy.com/retezamekukazasonorivas.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 5320 bytes
SHA-256: 331f5ec5cc98171bc6a42e7634202b22fdcc84b13670fa5e68e1961940039757
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 11064 bytes
SHA-256: 39674690a5d4121ad63adc25a5e31a77bd0424ecc46c979e843b990e094ca5c5

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