Malicious PDF — malware analysis report

Static analysis result for SHA-256 7409ed389594eae5…

MALICIOUS

PDF

72.8 KB Created: 2021-05-07 23:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 39966ca72e093e777730e2f080c95b89 SHA-1: cf0ea781efb2386f3189c067f38b987398916269 SHA-256: 7409ed389594eae5717a0a89d2c4a632fea5f6672e8735594094c6b9db3247b0
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to other PDF files, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are used to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=singer+457+service+manual PDF link annotation
    • https://vejilete.weebly.com/uploads/1/3/5/3/135312445/5370822.pdfIn PDF document text
    • http://gapixurujotem.22web.org/terusamonogurufipakoxamut.pdfIn PDF document text
    • http://usacarins.com/gomamat3z9ea.pdfIn PDF document text
    • http://bullbananavannaone.xyz/xosamimosusuj3ntn5.pdfIn PDF document text
    • http://hihikane.space/bar_graphs_and_charts_worksheetsafw20.pdfIn PDF document text
    • http://ita-bio.fun/neil_gaiman_neverwhere_charactershmjo7.pdfIn PDF document text
    • https://kuwujevo.weebly.com/uploads/1/3/4/8/134864034/kosow.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/senexikimademinipewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapufojutujat.atwebpages.com/suladabasuraromi.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/firexonevupuvezava.pdfIn PDF document text
    • http://soxarigur.myartsonline.com/pyrolysis_biochar.pdfIn PDF document text
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_db85ab02275f4949a503ee3ecf252ee2.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_fc10a0904d234a2c96aa8e8f7df71d28.pdf?index=trueIn PDF document text
    • http://jivinogitejif.epizy.com/cambridge_certificate_in_advanced_english_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/jarowifemor.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_079c3ed6cc0f4520a4bd27dd6d7d1e6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/setigafat/gebok.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/chrisley_knows_best_season_6_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/55013249471.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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 5572 bytes
SHA-256: b2444a0e6c8c0456cb2880946b49b33b4eb06d90a7d013aea7aef6947122e0ce
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 10676 bytes
SHA-256: 42af46e5f2a420c4e5875e67e6d30c0d8c3f99981aa55e0ebad14c2eb01a65ec

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