Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaf9251d8c2c940…

MALICIOUS

PDF

76.5 KB Created: 2021-02-21 02:46:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d34c7f7773ab57ac7ee564d8edf6bdbb SHA-1: 13788bd1a75b588a5ed663958afe33c44657323f SHA-256: cfaf9251d8c2c94018d7a86c8c9b13586a6a84f8391f4346b0073652c726af02
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains text related to interpreting DNA gel electrophoresis results, which is likely a lure to encourage clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=how+to+interpret+dna+gel+electrophoresis+results PDF link annotation
    • https://nivavige.weebly.com/uploads/1/3/0/7/130739715/daa3769255e1.pdfIn PDF document text
    • https://zejibepubik.weebly.com/uploads/1/3/1/0/131070590/sugilufigopufege.pdfIn PDF document text
    • https://vixalabalu.weebly.com/uploads/1/3/4/3/134396729/rotarinuru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_602117116b1d1.pdfIn PDF document text
    • https://jugomezaxazodo.weebly.com/uploads/1/3/5/9/135994004/5730849.pdfIn PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/zomewijo.pdfIn PDF document text
    • https://fonabanobegax.weebly.com/uploads/1/3/1/6/131636781/3981502.pdfIn PDF document text
    • http://helper-badges.com/xakusedajevezivirirobo8c3ts.pdfIn PDF document text
    • http://aarbuz.space/930130374091rtrb.pdfIn PDF document text
    • https://nudabixe.weebly.com/uploads/1/3/4/5/134505388/gadoripa.pdfIn PDF document text
    • http://osthondroz.com/zumisuxojowagitagerumarl0g20.pdfIn PDF document text
    • https://nexitikobimefa.weebly.com/uploads/1/3/0/7/130776699/romereg-zojetutagaderek-mubuju-xaletetuxug.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/9610057.pdfIn PDF document text
    • http://simomezubuxo.22web.org/11642905496.pdfIn PDF document text
    • http://pifafuvutote.iblogger.org/honeywell_chronotherm_cm907_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 5388 bytes
SHA-256: d5857153f07942b335d6086e1c1bb12fe26700c00320b7e1dd4909d6c1577180
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 10720 bytes
SHA-256: 7814bd5840e6b3ac6d09c5181fd584a5c9b10a3a56d9d23b1e7c8afae7ddfead

Open this report in the interactive analyzer, or submit your own file for analysis.