Malicious PDF — malware analysis report

Static analysis result for SHA-256 999e16edb4e40459…

MALICIOUS

PDF

90.9 KB Created: 2021-06-08 21:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c4c7a5681a9404d90f86a3e9df3218a6 SHA-1: 681eff550adee7362100c9f2ebc987282a7b2c9f SHA-256: 999e16edb4e404591c646add328d7209da5f4613c0d732592050425b1e4f0c90
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/pbw?utm_term=the+morning+sidekick+journal+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374374/normal_6038fd27d682f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5fe0d1a2b7177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391899/normal_6062e9aa8a39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_60113d76c2a63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409811/normal_60188a9245815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_604209913b482.pdfIn PDF document text
    • https://kufifelukabi.weebly.com/uploads/1/3/5/2/135297374/5c35b8ce98968b.pdfIn PDF document text
    • https://kepelawurolunuz.weebly.com/uploads/1/3/4/0/134017158/jolewawavulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_600d0e5f5bedb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_6056b0e919b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457868/normal_60bdba71e72cc.pdfIn PDF document text
    • https://wegidakalulat.weebly.com/uploads/1/3/5/3/135337254/13068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a13c97-0a77-40cf-a7df-cf0f6e02dd59/95247232542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d963c0e-3941-404f-925f-2025025a1cc7/power_plant_process.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a29cf7-6a22-4bcc-80d1-b0ce941a167a/41876289966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59ed7e9-d915-4616-91d9-9aa9f91e993b/best_commodore_64_motherboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0f3791-b6be-4ee5-94ce-b6a0c1b0cf6c/how_to_use_the_kitchenaid_attachments.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144742914/fonowokumawosimizededawug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57ceac5-1daa-4a50-a891-abfa0da5e494/jurumabujuxima.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/kazonunasifid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f1cd8d-2da6-4f54-82c7-2967a6b8e797/21910226702.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_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 5752 bytes
SHA-256: f81df2aaba31b054221d2ff09fb6ab721622071fd30b7613a42b0a7a6ee137e6
font_01_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 11840 bytes
SHA-256: 662e1a6619f256cf61a8701a0edf2182269f890851760eb6d034690252789d79