Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc54c965c5debe1…

MALICIOUS

PDF

77.1 KB Created: 2021-04-21 22:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0d1d79391f5f421664a416d0f4f7dee4 SHA-1: 57cc3517c7973150280da7ef8fdaefef6c51342b SHA-256: 5fc54c965c5debe1fbf02b98a8a40b1aa651a708cbc597b6fd5f3394cb81566e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL parameter 'utm_term=laser+cut+pals+panel', suggesting a lure related to laser-cut panels.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=laser+cut+pals+panel PDF link annotation
    • http://blancop.xyz/zamyatin_we_analysisqe3zd.pdfIn PDF document text
    • http://xudikuruno.iblogger.org/20091116715.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/bulk_density_of_grains.pdfIn PDF document text
    • http://detonic-official.website/epic_7_yuna_connection_guidek0j3p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_600d5f872f6ed.pdfIn PDF document text
    • http://wivupivipewezap.mygamesonline.org/electron_deficient_compounds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458124/normal_6052a318499f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459777/normal_605077b571315.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/kulomotaduturov.pdfIn PDF document text
    • http://fakutuzogazu.sportsontheweb.net/sindh_textbook_board_jamshoro_english_book_9th_class.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/archicad_17_tutorial_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480889/normal_602e06175599d.pdfIn PDF document text
    • http://swiss-gear-top.xyz/m_audio_axiom_pro_49_drivershxfzs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_5fe89cb37bb96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojifasipok.rf.gd/glioblastoma_multiforme_end_of_life_symptoms.pdfIn PDF document text
    • http://kikanaxop.rf.gd/besoxifamibiriwofalewul.pdfIn PDF document text
    • http://fokuxukidedir.rf.gd/30018265947.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_50cdb7d835d148d7b5b893a107eac708.pdf?index=trueIn PDF document text
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_0b80a5a4a8ea4fb5adea3b7820d2d560.pdf?index=trueIn PDF document text
    • http://fatofugo.rf.gd/34247575227.pdfIn PDF document text
    • http://lojogonofar.rf.gd/freshwater_aquarium_fish_list_with_pictures.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_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 4868 bytes
SHA-256: 91dee143ee2573e56ea66d26d1bc589c029dfd59d153a3fbf7487d040e41fba6
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 11472 bytes
SHA-256: 2039a0a268212aa3ea200a0057769d1ce300fefaf3bc3ff4cec90dbbb6ebdc4a

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