Malicious PDF — malware analysis report

Static analysis result for SHA-256 5637b44bd72630c6…

MALICIOUS

PDF

65.0 KB Created: 2021-02-23 04:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 190fb203afef563be5677800c01e3985 SHA-1: 139fd64c2763345c4f8d716048ae2fb05c8a1bdc SHA-256: 5637b44bd72630c63b8edaf20ee65c956a0851025fcdb619577ef4c13d68791c
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that lead to link farms and disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=english+9+fahrenheit+451+reading+guide+part+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371010/normal_6008b1a15708a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_600ef1691fa00.pdfIn PDF document text
    • http://sodahq.club/141899187504boh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_6016c3dd4a762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_6005c3507a170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403819/normal_602f99872ce2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_602992c29b809.pdfIn PDF document text
    • http://solavopuna.22web.org/42804740587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xasonivuk.epizy.com/67778067393.pdfIn PDF document text
    • http://dizutobasuxolom.epizy.com/crusader_kings_2_3.0_1_download.pdfIn PDF document text
    • http://rexawisoza.epizy.com/26995481850.pdfIn PDF document text
    • http://mepizegavipin.rf.gd/wills_eye_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/3174783875.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_off0000c138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 5844 bytes
SHA-256: a16560bf49db92d8e790b2362e35eb399db9acba398df610a76ca19f1741d10c
font_01_sfnt_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 9828 bytes
SHA-256: f331779e1ae013497c426415e6dfd6ece5a2bd97eba8e7c3f7e72fe11b3c685a

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