Malicious PDF — malware analysis report

Static analysis result for SHA-256 788eb3ee43197f15…

MALICIOUS

PDF

66.9 KB Created: 2021-02-26 01:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1dff3b0ab32abd821d7f0373f3d42d1d SHA-1: e87836d74036b01245ccbd19acbca3a018e3d312 SHA-256: 788eb3ee43197f15bbc8fc9cb83dd8bd0018b6c0e80a50332a6034ff2c876b63
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed for phishing or traffic redirection. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=the+real+book+of+real+estate+audiobook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387420/normal_6017181737703.pdfIn PDF document text
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/8506335.pdfIn PDF document text
    • https://dijamolilum.weebly.com/uploads/1/3/5/3/135347404/fidugukar-dukedefi-sufeberu.pdfIn PDF document text
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/2645761.pdfIn PDF document text
    • https://gofolonuk.weebly.com/uploads/1/3/4/3/134313710/mulazitoz.pdfIn PDF document text
    • http://gisimijesizugo.22web.org/43158034918.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/html5_and_css3_tags.pdfIn PDF document text
    • https://lugonejiborin.weebly.com/uploads/1/3/5/3/135336075/muwuti.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/fowemalepegal.pdfIn PDF document text
    • https://merusomewazotom.weebly.com/uploads/1/3/4/5/134514041/4fe93f2790dc381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vavuduzika.epizy.com/organic_chemistry_formal_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/91980966942.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_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 5148 bytes
SHA-256: 47121a16b00e7fceace193e9de65822b65fc54a39469f086024f6fd8358a68aa
font_01_sfnt_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 10596 bytes
SHA-256: 52f6444913eca4f6f4aa2d73f2de79f385d78ec167538e4f85e164309a33fbd8

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