Malicious PDF — malware analysis report

Static analysis result for SHA-256 308877630959fa95…

MALICIOUS

PDF

79.5 KB Created: 2021-04-11 11:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8b209f87fd05cd42fccae355328ab818 SHA-1: 7b4437df8e8767a20f91166b7965fbf602a3d792 SHA-256: 308877630959fa9518e23b89216eed7d146f22e9d8d2eec9ecd4965d23ad726a
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and heuristic analysis indicates it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=how+to+adjust+kohler+thermostatic+valve PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5fd7cf94da7fb.pdfIn PDF document text
    • http://luchdobro.site/snow_white_prince_florian_ageb8zx5.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/OIS9yhb/hotels_with_water_parks_in_panama_city_beach.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/djdiijc/how_to_make_chicken_goulash_soup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_606295dd8a5ef.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/aji8ie2/xaduxasonefoluxexivafo.pdfIn PDF document text
    • http://amaryllis.space/artillery_sidewinder_x1_v44qhoi.pdfIn PDF document text
    • http://zespodsvetkoy.site/voltage_drop_calculator_3_phasexuhl2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372737/normal_5ffb61b974a00.pdfIn PDF document text
    • http://13millions.store/consul_template_range_servicewnvih.pdfIn PDF document text
    • http://robinmani.site/whatsapp_messenger_for_blackberry_boldrj54e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_6050fd1c35940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5fee39d970619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_98bfc85fbde74c80a33b89cfb71b17e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3f73ae-63e1-4e93-b338-c77abba29468/best_tarot_decks_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ee9042-5591-401b-9cdb-ed639955ea96/what_is_the_closest_cvs.pdfIn PDF document text
    • http://fapugiv.rf.gd/greatest_common_factor_gcf_worksheet_answers.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_c4d6862649a74588851e2bac0474310e.pdf?index=trueIn PDF document text
    • http://bibarixe.epizy.com/84087324097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d710b01-235f-430a-90d3-b348b7462198/rigigigawoxudokivilosojer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd3677b-df9a-48db-87ab-c5f5ed560a85/rikki-tikki-tavi_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5248d750-beb0-4e8d-a1ea-4ccaeb3b1eef/force_safesearch_google_chrome.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_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 5432 bytes
SHA-256: 2dfc1ab82f3b89f0ee375cdcf3398069a15b5fa40b8246d078e46ad55b811f3f
font_01_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 10296 bytes
SHA-256: f376ba8c942a7223e0a7a755ebae76452ff16ab39cfdd847b66231d5cb4c1eab

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