Malicious PDF — malware analysis report

Static analysis result for SHA-256 4215a49747e52c95…

MALICIOUS

PDF

75.1 KB Created: 2021-02-16 10:26:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 59483c3dd23923970298c5ce35408039 SHA-1: d9b2c165a85a512618b12c6d6e1ba7908a58006b SHA-256: 4215a49747e52c95eeafcde09b61f8fa6ac97e7d85db7e78aa0d5169a651340c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://jottigo.ru/strik?utm_term=excel+2016+classes+online+free PDF link annotation
    • http://dehydratedoriginalgoodness.com/elements_of_petroleum_geology_by_richard_c._selleyolfza.pdfIn PDF document text
    • https://satuvimafinob.weebly.com/uploads/1/3/0/7/130739393/7122145.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/xejavunojofi.pdfIn PDF document text
    • https://gizafagubezuz.weebly.com/uploads/1/3/5/3/135321184/fd2af68d7762c71.pdfIn PDF document text
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/bagumax-zafexotefevawa.pdfIn PDF document text
    • http://luminar2-download.xyz/poginunoditukogetofowolokaxvar.pdfIn PDF document text
    • https://perasukene.weebly.com/uploads/1/3/4/6/134644841/7180960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_600f3c4a2585c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382639/normal_6006242448228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484806/normal_6023883011520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443588/normal_5fde12c777a5c.pdfIn PDF document text
    • http://air-calm2.club/gowomomigozuwovng0m1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ff1f4a3728a5.pdfIn PDF document text
    • http://myyshooop224.site/289988820798qnlj.pdfIn PDF document text
    • http://republvinb.fun/75756762470rvumz.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/8cdf8f48678474.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

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_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 5380 bytes
SHA-256: 675952fbb292cdd2d73524e6249a81c62fa5de3a5075ae7c483be7e88ed791b8
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 10720 bytes
SHA-256: 7aee3551ef7f5424b6632de52ea166c458d886d72707e0197b0e930354105c9e

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