Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f2db633761926e…

MALICIOUS

PDF

66.3 KB Created: 2020-11-19 03:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 66174b2ed1a3c2093d6fe2232c115b95 SHA-1: d817c85e2f4166e956e440c9b3fd390eef9cf514 SHA-256: e3f2db633761926e045e58d6318db66bf58efaa93a58fd4801f891fdb16f82b6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=dsc+alarm+system+manual+pc1555 PDF link annotation
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/5102958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_5fb02f70d0370.pdfIn PDF document text
    • https://suleduzon.weebly.com/uploads/1/3/4/4/134403341/2196203.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/vuses.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/vefolebumupab.pdfIn PDF document text
    • https://lusefova.weebly.com/uploads/1/3/4/5/134583673/60996.pdfIn PDF document text
    • https://nedudefo.weebly.com/uploads/1/3/4/3/134389218/347fde.pdfIn PDF document text
    • https://jedotulaxadetin.weebly.com/uploads/1/3/4/5/134587896/tunadebo_sajiwat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/american_gods_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7493cb85-f42d-4502-83b6-ba47e515abc9/60733792603.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/74577219673.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/age_of_contact_era_in_texas_history.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_off0000c786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 5356 bytes
SHA-256: 23081af1fce5c9f0f39230e861c3bd58b39f6c94bdaa8108c8f96fc33d810d65
font_01_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10124 bytes
SHA-256: 0a44da385106bdab219b1fe07f90c923dfddf57430c5465814c7cec4c7595a7a

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