Malicious PDF — malware analysis report

Static analysis result for SHA-256 50454da63dc2e274…

MALICIOUS

PDF

91.3 KB Created: 2021-02-16 22:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 835aca091eddd0e6193aea02ee109801 SHA-1: 28c696c24c3b6cfebb8ec95c31fdcaac9d7b95ed SHA-256: 50454da63dc2e27465bd45607b4ca1632c8f789e87128b7d74cde685953f307f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/strik?utm_term=new+survival+movies+2020 PDF link annotation
    • http://fabimepela.22web.org/2606257461.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/jgd1Vhg/76598782729.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/kkFxKia/83616311923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5fec3ab2e57e0.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/hd45igc/jedusasozaxajatifinu.pdfIn PDF document text
    • http://tefosewun.22web.org/acsm_guidelines_exercise_during_pregnancy.pdfIn PDF document text
    • http://kawojoxakinit.22web.org/mail_merge_google_docs_spreadsheet.pdfIn PDF document text
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/dusolojaza_boxol.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/wevelowojet.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/5qhhfxq/17700024015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degejukifukux.epizy.com/benessere_digitale_google_apk.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/b_c_center_song.pdfIn PDF document text
    • http://zabirozoxut.epizy.com/17994078331.pdfIn PDF document text
    • http://satuvet.epizy.com/levers_in_the_human_body_answers.pdfIn PDF document text
    • http://zumaxupuvu.epizy.com/battlefield_america_video.pdfIn PDF document text
    • http://gunimafiru.epizy.com/68122492694.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_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 5224 bytes
SHA-256: 20f43409dcd9854b082a8fd3a51639f3392293276f944bb63a8552edae44f8dc
font_01_sfnt_off00013918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13918 11512 bytes
SHA-256: 5d85e4ff123332924b1a55d7e61832adb0a10dff5b8626a574c0b93561bcd18f