Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdabc0b5ab40522…

MALICIOUS

PDF

95.1 KB Created: 2021-02-14 03:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 54f0c89fd7d339eee3142aac637dad43 SHA-1: 829c053d45ceae0362c60d96fab857476fcaa939 SHA-256: fcdabc0b5ab4052296521d4e9c38f0176f190c77eb5d1d14c98ed615bce06015
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO poisoning or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://crophysi.ru/123?utm_term=star+trek+background+noise PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367268/normal_5fe06d4fb2db8.pdfIn PDF document text
    • http://sunesasewi.iblogger.org/93196063889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_601a0527b3148.pdfIn PDF document text
    • https://namavikevak.weebly.com/uploads/1/3/2/7/132740743/xogezuzuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fde6647168c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366655/normal_5fd09a89ac8a7.pdfIn PDF document text
    • https://zemedabumudog.weebly.com/uploads/1/3/2/7/132712209/zoxetanatedi_gesopawizukofas.pdfIn PDF document text
    • http://rapegutuxipik.22web.org/bicol_university_enrollment_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471096/normal_6008db8bb8796.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fecb3a41bc4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wamesugome.rf.gd/35072253780.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/pomuve.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/capsaicina_beneficios.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/2296907400.pdfIn PDF document text
    • http://medemamonolusav.rf.gd/76444915547.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/gegijefizelekenirujobes.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/63546153069.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_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 5384 bytes
SHA-256: d4eafabcc3b9afff220d15d203ddf8cf03b713be7da980a920eb771946dfcecf
font_01_sfnt_off000149e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 10924 bytes
SHA-256: 65d9eba4ef5b216b8cfd35b5e872dca447b6e2bfa2782bef4a983a2d9de08423

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