Malicious PDF — malware analysis report

Static analysis result for SHA-256 554cef5be4d02c60…

MALICIOUS

PDF

75.0 KB Created: 2021-03-19 06:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fede6c6cdb8a71c8d84335ff26532454 SHA-1: d09c1cae0ad06979627cbc13628c97a4ee4a48cb SHA-256: 554cef5be4d02c606b1d9abec5fdc154aa56ffadc7a2230061d6e9c7f9cb9e89
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('maypoin.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious, likely a phishing lure.

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 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://maypoin.ru/wix?keyword=cry+lyrics+kelly+clarkson PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477409/normal_601309d92e704.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/fepuxozudononakopes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5fcaf6be81e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459322/normal_603a9d340b4ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446398/normal_6043b975013ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_6016b41dc8366.pdfIn PDF document text
    • http://wotegop.22web.org/kill_team_elites_rules.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/jepedetofumikepuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_51c240b838864d0080f598fb1918c0df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukedil/catalogue_muji.pdfIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_80aeccf7b25b436e9d0fc854c4bced6d.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_d29b14a5a33c439cb5459b3a7820f48c.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_c3ca92e6d8fe40e6b9a862518cf6bafa.pdf?index=trueIn PDF document text
    • http://beduxuluwuniva.rf.gd/devofub.pdfIn PDF document text
    • http://nunowezowijoper.rf.gd/dyson_v10_animal_plus_cordless_vacuum_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/nudora.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/cultura_brasileira_alfredo_bosi.pdfIn PDF document text
    • http://diruxepuf.epizy.com/.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_bdde43866106463893e953aa0890c756.pdf?index=trueIn 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_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 4864 bytes
SHA-256: fa2cdefdc69c8397a5bee3d9f8ffc65da13190e78bca2a6c07cd15f4fe8e6b29
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 11228 bytes
SHA-256: 657759525306b3540da71d7f03fddd394333fd1a8700040df393c8e1bdcdbe66

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