Malicious PDF — malware analysis report

Static analysis result for SHA-256 188a8e76530bfcff…

MALICIOUS

PDF

74.8 KB Created: 2021-03-15 01:00:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4db92c7822ff22b660b714083647b388 SHA-1: eb00cc21b390be05566dcd4eda9165628f32e11d SHA-256: 188a8e76530bfcff8a245193e262f09e9dbd8c1194b99295e544e977abd199ea
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://resalured.ru/wix?keyword=misc.+debit+meaning PDF link annotation
    • http://tosefabebiribow.scienceontheweb.net/muxukepaxiji.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/whose_child_is_this_song_lyrics.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/8189460.pdfIn PDF document text
    • https://gosinixubog.weebly.com/uploads/1/3/4/8/134875818/5563e830a0.pdfIn PDF document text
    • https://miwovikefutus.weebly.com/uploads/1/3/0/9/130968988/demosesuvadele.pdfIn PDF document text
    • https://zemijawa.weebly.com/uploads/1/3/1/0/131070152/tixitokogesazitage.pdfIn PDF document text
    • http://wiwuwanulujero.iblogger.org/napoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sizikipap.epizy.com/christian_songs_tamil_lyrics_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/56551388929.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_73693fb55964469fae711ade5cee5b04.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_64a9facb021b4260aeaaaad28dd59fbf.pdf?index=trueIn PDF document text
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_c10f366146ce43c69768a7cb09bcd39b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomakobez/2498228917.pdfIn PDF document text
    • http://delitareba.rf.gd/biology_ncert_class_12.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_e1c1c8026ca042d895c8d2c9074ed96b.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_d0bf43e29735421982bd97c7790612f0.pdf?index=trueIn PDF document text
    • http://binasizula.rf.gd/history_of_corpus_linguistics.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_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 5308 bytes
SHA-256: 32e0e1675d6a67ae161fa3aa6066fb64f12bec5a6be543ba3fb56ef026d444b9
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10020 bytes
SHA-256: f9c25e813398dd88c5cfd3169f2032bb027cc6ef6a7dad69302d2bc504c0fe5b

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