Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd5d4201cf94137…

MALICIOUS

PDF

69.9 KB Created: 2021-03-19 03:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 25b82b0f09e1f9fcb2459755d6586569 SHA-1: c6bc64bbb048f09bf697ac7b754d941ed419451a SHA-256: acd5d4201cf9413790a5ce36f34474bf4d11a4fcab8549fc77b3714e68e8a7ee
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by heuristics as a link farm and potentially phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded content, though heavily obfuscated, suggests an attempt to redirect users to malicious sites, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://kuzutuzo.ru/wb?keyword=dell%20precision%20m4500%20memory%20upgrade PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fff97aca4877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_601b350f6f453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490380/normal_6043436150957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410986/normal_6052a867ce584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_60503e0f19663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_60230d336b07a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_60433589ebf91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414339/normal_5ff35ebcc1889.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369775/normal_5fff929c5179f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_6029eb5ed8106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5feb573462066.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/6596280467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_600a134a2f3ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://38a589f5-619b-4230-bc7d-f88d9fc6dac5.filesusr.com/ugd/392051_c9b69aa2587f434f8b3686f22738c337.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_c7d05248073f40dd9e8cddc3909ed03f.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_e5c6a87716cd49b499200532db726956.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/corporate_finance_jobs_chicago.pdfIn PDF document text
    • http://nopugorib.onlinewebshop.net/doguvatoja.pdfIn PDF document text
    • http://kuxubakelixuzot.atwebpages.com/canon_lide_110_scanner.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_4e3146320095433199ecf01c72764a48.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_4cc1a73676364f23aae909cc530296ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizedumi/ayushman_yojana_trust_online_form_2019.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_off0000cfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE6 5848 bytes
SHA-256: 3a9fdb736ddae579a71189f297feeaae4dd0e7793cd51f94ce90959cbda8534c
font_01_sfnt_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 11192 bytes
SHA-256: 791e390d19a74f31a6ea1b6db069d7f7096bd866db8bb766fb5f35c40f781acf