Malicious PDF — malware analysis report

Static analysis result for SHA-256 2544cf5fa471bc8f…

MALICIOUS

PDF

85.0 KB Created: 2021-03-31 05:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1be1846006f19e2bba4b47a6e238072b SHA-1: 9ba38624fbd8543aa28d4d8ffe1107654798ebec SHA-256: 2544cf5fa471bc8fe19f12517dc79783dd4a7c316fcb057b8ff8e2c9505514ac
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URLs, with at least one being part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure indicate it's designed to lure users to malicious sites. No scripts were extracted, but the PDF's nature and URL usage strongly suggest it's part of a phishing campaign.

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 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/award?keyword=capsulitis+adhesiva+pdf PDF link annotation
    • http://vojemodipu.sportsontheweb.net/dirosifajetevelex.pdfIn PDF document text
    • http://gloslides.com/65632018570d0lfw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455176/normal_5fc57325679b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475389/normal_601c9b6ef2103.pdfIn PDF document text
    • http://copyrighthelpptteam.com/75242780271450pg.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/zavunufa_wekurojunakis_xewedelezuzaw_fivane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460686/normal_604d6c5aae53b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460071/normal_5fccc5bed3bb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371240/normal_5ffd7cdd89b61.pdfIn PDF document text
    • https://rusenudiwupelor.weebly.com/uploads/1/3/4/7/134704890/jakapabepojuv.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/10554119154.pdfIn PDF document text
    • http://apparentlyopt.com/sapijufibosafepikmm2y7.pdfIn PDF document text
    • https://talokawibameze.weebly.com/uploads/1/3/4/0/134000376/5fbcd19238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_60502c37b1a3e.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/xakujipikane.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/5208e8aa-fa26-4767-8087-39463ab2db79/64753533831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63130223-4a0e-425f-bdff-6ba26d641c98/craftsman_5hp_20_gallon_air_compressor.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/what_does_the_story_of_cain_and_abel_teach_us_about_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac0e6ea-5e96-4912-9dbc-2a0f641f66e4/how_long_does_dough_cycle_take_on_bread_machine.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_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 4996 bytes
SHA-256: ab3bdaeb2ecbbe069e8794208891c5eefe47071c0cd8f128e45217ff8456dbc2
font_01_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 12304 bytes
SHA-256: 935bcc1cef8f7baad1f4843c630d3033383a64637aec45a23db02bb809600147

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