Malicious PDF — malware analysis report

Static analysis result for SHA-256 319eaf5118d9abc5…

MALICIOUS

PDF

92.1 KB Created: 2021-03-20 00:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a0c31dc3ca9f68b03f4a7122f7116742 SHA-1: 666eced2a4bdb412cd0b4651433bea7a0e91fb04 SHA-256: 319eaf5118d9abc5c735376c25eb6bfe94f3b863897ac57e428ef4d1e600c39b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URIs point towards an attempt to exploit users by directing them to potentially harmful websites.

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://lozipotod.ru/123?utm_term=los+cuatro+convenios+de+ginebra+pdf PDF link annotation
    • https://basalusorur.weebly.com/uploads/1/3/4/6/134661810/satobinodapoxeto.pdfIn PDF document text
    • http://puwobero.22web.org/what_is_taught_in_college_algebra.pdfIn PDF document text
    • https://ruputosara.weebly.com/uploads/1/3/4/4/134456906/7dfb2111698f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481825/normal_6001560b1c171.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/vigunuvezelelekuxofa.pdfIn PDF document text
    • http://bulakirip.getenjoyment.net/6111671391.pdfIn PDF document text
    • http://bavomobes.22web.org/b._a._paris_za_zamknitymi_drzwiami.pdfIn PDF document text
    • http://mutinujevax.22web.org/cashkaro_app_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_603bb77bb3bdc.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/558801ea-278f-4e3b-b2ef-6cd0343e82ef/john_grisham_movies_on_netflix_uk.pdfIn PDF document text
    • http://xutasiwewuzaf.rf.gd/81593256192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cba5e900-995a-4bc8-9541-63f35c080847/73413349883.pdfIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_b07ccb2608d541c6bee724a4c71ced2f.pdf?index=trueIn PDF document text
    • https://ef4f51cf-aae9-439d-85d5-db2134c8a05d.filesusr.com/ugd/8a9083_df11dcf3580841e98a5f23e0872e935c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bc0fe7-3be3-4043-adc7-baf08b46763e/elm327_mini_bluetooth.pdfIn PDF document text
    • http://zokazote.rf.gd/55224820891.pdfIn PDF document text
    • https://05f6fcc2-a4c7-4d5b-b58c-97b640a93f4d.filesusr.com/ugd/74147a_031f8d57022b466c89efcb0b495021e4.pdf?index=trueIn PDF document text
    • http://telosizaba.onlinewebshop.net/daropiz.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_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 5432 bytes
SHA-256: c1e0ab12259fcce3398f1bab8b6ff6d9404caadfa4698392465ca3234f8ef7ed
font_01_sfnt_off00013739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13739 13700 bytes
SHA-256: 7e7a58e69783e52154b614749a755a047087253b87e8176c8494fb84379d87a8

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