Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6b942515689ef1…

MALICIOUS

PDF

72.0 KB Created: 2021-01-26 12:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8a0a7a4afb054c864528a2ee5c0f746a SHA-1: 7e3ead59ff45088bc13158999ce17a5b9e7dcf23 SHA-256: bf6b942515689ef170e7da19740e33e54543ac171fe824aea422b6a54799feaf
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern. While no scripts were explicitly extracted, the nature of the links suggests a potential for redirecting users to malicious sites or further payloads.

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/123?utm_term=how+to+make+an+acoustic+guitar+sound+like+a+resonator PDF link annotation
    • https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/vujuli-ruteden.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/pepotapososex-ligitem.pdfIn PDF document text
    • https://tebeneka.weebly.com/uploads/1/3/0/8/130874559/midamereripifuginuj.pdfIn PDF document text
    • http://reduslim-shopufficiale.site/japukomevoxedanererubis31m.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/lotagebo-tokuxadif-bamazu.pdfIn PDF document text
    • http://copyright-infringement.business/tiny_world_apple_tv_plusvkqyv.pdfIn PDF document text
    • http://lisolu.org/evoland_switch_physicalrwn4l.pdfIn PDF document text
    • http://rating-bookmaker.ru/670414357sg6z6.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/c9be1b24.pdfIn PDF document text
    • http://itagreen.fun/94005333348lgio0.pdfIn PDF document text
    • https://wapapoda.weebly.com/uploads/1/3/4/5/134581042/xamakukokejeg.pdfIn PDF document text
    • http://masterpowerpoint.com/tuzulimogavozavinugiw48mz.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/8398055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sotilikesad.epizy.com/xufewezavepejije.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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 5376 bytes
SHA-256: 871c63a383965fc53af6ea24559157dee4385193c6a979e0fe0d2fad00880040
font_01_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 10520 bytes
SHA-256: a53660ad361dd9983a839af1ebb8736945e4084bf566dd112ee167644ea6e822

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