Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac0232910b2d637…

MALICIOUS

PDF

104.3 KB Created: 2021-02-21 21:04:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8c431f9d987cc844867bfdd7f5bdf0ff SHA-1: 97b96eef2470a26b2c6e59846cdcf4d5a336fc58 SHA-256: 2ac0232910b2d637e3e568d9f34510c3a92266a39241c81f8b71fcc6a9703202
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary goal is to redirect users to potentially harmful external sites.

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 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.
  • 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://druttle.ru/123?utm_term=agar+for+non+fastidious+bacteria PDF link annotation
    • https://gasezojilatinoj.weebly.com/uploads/1/3/1/4/131455825/5272944.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fca74a7c1d28.pdfIn PDF document text
    • https://dijamolilum.weebly.com/uploads/1/3/5/3/135347404/tevipubexaf_wesugokejejop_gititozeb_winez.pdfIn PDF document text
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/48cefe.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/8b08b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fc58529bcf8d.pdfIn PDF document text
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/4c18835daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_600f10a883d17.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/saxufojop_desad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497093/normal_5fdf04a7cafbf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5feda1881aeee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427523/normal_5ff447057d407.pdfIn PDF document text
    • http://juluzenaluziwo.22web.org/how_do_i_sync_my_logitech_mk700_keyboard.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/66cbde3f242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://makijozexu.rf.gd/10012561583.pdfIn PDF document text
    • http://rujuramu.rf.gd/kaththi_tamil_movie_song_ringtone.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_off00015a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A93 5288 bytes
SHA-256: aee30f19edd457651449cfc30d4e0703011ed8ebdf82cc4c40767dbb757cd369
font_01_sfnt_off00016ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA4 11604 bytes
SHA-256: c2140b9c1bcaa7d0909ccfb8147833a466db2c625f03cbadfb0d6b2abd39a838

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