Malicious PDF — malware analysis report

Static analysis result for SHA-256 65aa433919509d1b…

MALICIOUS

PDF

79.2 KB Created: 2021-03-20 18:30:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 05467c3891ddd296a74e1702f902af55 SHA-1: b1fb660e9fa8394cc90405c2c90fcd078f0d95e1 SHA-256: 65aa433919509d1bdfea509b7c774ff138743fbde1e80c20b88804044f0240f3
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'award', suggesting a potential lure or SEO manipulation tactic. No scripts were extracted, but the presence of numerous external URLs points to a malicious intent to redirect users.

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://leonvi.ru/award?keyword=deficiencia+de+vitamina+e+en+aves+pdf PDF link annotation
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/pewili_wunenoduzatipi_naboginorew.pdfIn PDF document text
    • https://japujavawewiri.weebly.com/uploads/1/3/2/6/132696154/kogav.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/sodalogedeluketesupinuje.pdfIn PDF document text
    • http://dibosezufo.getenjoyment.net/nalibegufewazu.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/what_is_cof2_polar_or_nonpolar.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/93084176032.pdfIn PDF document text
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/821dd.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/bowling_shirt_pattern.pdfIn PDF document text
    • http://suwetobolubujub.getenjoyment.net/greenhouse_gases_file.pdfIn PDF document text
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/627023.pdfIn PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/4492303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_331460df8ca241fca6d930c4852b9875.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_e187a3e0e7fe4db98d947eb1d95ae3a0.pdf?index=trueIn PDF document text
    • http://parepakikil.epizy.com/55910258150.pdfIn PDF document text
    • http://pupenedu.rf.gd/wahl_cordless_dog_clippers_review.pdfIn PDF document text
    • http://badamowafe.onlinewebshop.net/41876409571.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 5232 bytes
SHA-256: 8b6de3e981fa02ff05999f3daa980d1664ea1944038f5ab2f9e937f248df057a
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 11872 bytes
SHA-256: 192eda4c99950e496eabdae2215819d346f5db64458b005aac4257a55107608e

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