Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f0eafded3964ca…

MALICIOUS

PDF

77.5 KB Created: 2021-01-19 11:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 50acf0cf35ec987f13d4ddbbe733ea3f SHA-1: b5b1d0019037e92e2b736b74f305790382ab573c SHA-256: 42f0eafded3964caafeb0fd0832891d3119bf231ec1ff0580bd6001303415af7
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffset.ru/123?utm_term=ark+extinction+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471723/normal_5fc728ed03436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487894/normal_5fbcc91682576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_5fb5c9a26f4e4.pdfIn PDF document text
    • http://penerete.66ghz.com/form_956a_authorised_recipient.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/6811363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_5fd8a10ae8708.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/dreEFon/tripp_trapp_baby_cushion_grey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_5f8e79b7e0b3e.pdfIn PDF document text
    • http://delojenopow.66ghz.com/mandatory_reporting_victoria_teaching.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493890/normal_5fce940dd3aea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fd050983ba43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_5fe5dd9da81aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5f9742669fff5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454813/normal_5fe815ffb2621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinipukax.epizy.com/ielts_listening_answer_sheet_2018.pdfIn PDF document text
    • http://bibobega.epizy.com/abhinetri_2_movie_naa_songs.pdfIn PDF document text
    • http://poziluxolebulu.epizy.com/99141063729.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 4808 bytes
SHA-256: a27a1726c661c2cd690b69cca38acbf6176fa14969449d059d3f19f0bc88e90b
font_02_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 11600 bytes
SHA-256: 67aca1edda105338952f3cc7d06b7780bd72c32b640491a2034ed0c8e22a9abe

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