Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0077b477d6ef928…

MALICIOUS

PDF

75.4 KB Created: 2021-02-10 05:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6d7a309fd998de8f58ee26eb5a544446 SHA-1: c19f460d53bb036ca8ea776d7aaf7c7a10237075 SHA-256: c0077b477d6ef928cf3e82bf7858264fc1ed9275bc3d2a6879b346fc1a71ce85
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to various websites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or SEO manipulation attack pattern. No scripts were extracted, but the PDF structure itself is being used to facilitate the malicious activity.

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://druttle.ru/wb?keyword=modified%20opinion%20audit%20report%20example PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462096/normal_5ffb199abf1d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421329/normal_5ff80c67e7527.pdfIn PDF document text
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/bawif-nelepijukatake-tivokexipugum-kopakukijip.pdfIn PDF document text
    • https://pigixona.weebly.com/uploads/1/3/5/9/135986477/bomomekopukipowik.pdfIn PDF document text
    • https://sosakenokez.weebly.com/uploads/1/3/4/4/134445245/e26680c9b8.pdfIn PDF document text
    • https://xadinizojagum.weebly.com/uploads/1/3/4/0/134016813/83917f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5fe9b6e965cee.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/danevejesomuzaluvij.pdfIn PDF document text
    • https://nozugaxuxanukuj.weebly.com/uploads/1/3/0/8/130813784/8433209.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/1751562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_602330ff25ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478927/normal_5fd70e7e5fa92.pdfIn PDF document text
    • https://futiwoku.weebly.com/uploads/1/3/5/9/135957929/1e6215df3f9737.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/nazekisigiduz/baking_cooking_terms_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/bhoothnath_returns_movie_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/zorit.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_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 5084 bytes
SHA-256: 39f5ddac053d882b657c23c7ed6b1bf464e7e9ec2969a26a6519bcb04faf9a47
font_01_sfnt_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 10736 bytes
SHA-256: 1c853be290fa24c370b93c07ad3ca9ecdbae6889c30ed1af4b1af6fdc027e123

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