Malicious PDF — malware analysis report

Static analysis result for SHA-256 2452488651ca5da7…

MALICIOUS

PDF

81.2 KB Created: 2021-05-16 12:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 22fd2844611ab88de67a700fa11205cb SHA-1: 99c0f7ec78cfcccec1d6ec22bad77585d8cc5dd4 SHA-256: 2452488651ca5da728880af44269f042a83e3ec9e04d1dd2bbe4d4e15a9795c0
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier strongly indicates maliciousness, and the presence of external URIs further supports this. While no scripts were extracted, the overall structure and URL distribution are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://dafemum.ru/strik?utm_term=huffy+men%2527s+cruiser+bike+walmart PDF link annotation
    • http://korsabarca.com/bal_brahmachari_film_all_songwnapb.pdfIn PDF document text
    • http://fisitupogavi.mypressonline.com/53833273000.pdfIn PDF document text
    • http://9gusevshop.website/essay_answer_sheet_of_upsc_topperscugxt.pdfIn PDF document text
    • https://kobuzonoge.weebly.com/uploads/1/3/1/4/131452837/likipizujisajexeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_6026f8e89c2f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_5fd9e3f49317d.pdfIn PDF document text
    • https://polafepunulud.weebly.com/uploads/1/3/4/7/134718340/2651246.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/converting_grams_to_kilograms_worksheet.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/51974942689.pdfIn PDF document text
    • http://mp4.design/670367234307tm2c.pdfIn PDF document text
    • http://koprovk.xyz/nj_jury_duty_reporting_mercer_countyitz8s.pdfIn PDF document text
    • http://asta-stroy.ru/business_proposal_sample_letterp3k4x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_60226aa8d68a5.pdfIn PDF document text
    • https://mowerezudajam.weebly.com/uploads/1/3/5/9/135966589/sogopazukis.pdfIn PDF document text
    • http://centerbluebadge.com/90954662020su03f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_60405a2224b4a.pdfIn PDF document text
    • http://ottics.ru/strong_concordance_online_free_esvougwt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_60063e4c7714c.pdfIn PDF document text
    • https://xuzajozobesafod.weebly.com/uploads/1/3/4/7/134718295/2109835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipebevu.atwebpages.com/how_do_you_critically_analyse_a_journal_article.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab39ba5-0327-480f-aaa9-80a676dae2a0/55453686373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be4dada-1a82-4683-a24e-d90d46ad8183/what_disorder_causes_anxiety.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/assinatura_digital_linux.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_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 5420 bytes
SHA-256: e554fa10b7901c9ecc84000b7f4ca0de202a87e0370ada51432b688afdc512c8
font_01_sfnt_off0001116d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116D 11156 bytes
SHA-256: 6d7fe8b1e74407f8edd6c04ff317dbf75569562329eeb00840f33834c7a03a55

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