Malicious PDF — malware analysis report

Static analysis result for SHA-256 b839d8e5c414ca64…

MALICIOUS

PDF

97.5 KB Created: 2021-03-11 03:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c4f1251d7a37ad68f1ded52ed810847a SHA-1: a70acb80159d5bd11c1c4c5b60838a52100b113d SHA-256: b839d8e5c414ca642b3abfc6a690dfa9d2e72b8b0dd4f9f44b68ccebf884e469
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be related to climate change, likely a lure to disguise the malicious intent.

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 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://gimoguvi.ru/strik?utm_term=how+to+stop+climate+change+at+school PDF link annotation
    • https://cdn.sqhk.co/didatife/jioaAij/simple_reversionary_bonus_sbi.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/ibjj9hw/40265559650.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/ggiidjc/gisiwetonitogasiwawonipo.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/gegog.pdfIn PDF document text
    • https://redawisifakaw.weebly.com/uploads/1/3/4/4/134481039/dosaded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5fdb6faa03e22.pdfIn PDF document text
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/8693743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473963/normal_6033265fe3797.pdfIn PDF document text
    • https://cdn.sqhk.co/wametofenuwo/ha1im5z/the_hangover_2_song_in_elevator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_6030a56b95861.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/how_to_clean_the_jets_of_a_whirlpool_tub.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/the_chronicles_of_narnia_the_silver_chair_2021_movie.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/what_is_antigen_and_antibody.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugenerefajujus.atwebpages.com/ph_food_chart_for_gerd.pdfIn PDF document text
    • http://monuwuvit.rf.gd/zegavexegeta.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_b335ffa948364a1880cc3f4b79916b81.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_6f7917ed8818472e926c1949db166333.pdf?index=trueIn PDF document text
    • http://zerakunutage.epizy.com/rudoj.pdfIn PDF document text
    • http://duwuneloragupi.rf.gd/kendriya_vidyalaya_gachibowli_hyderabad_sample_papers_answers.pdfIn PDF document text
    • http://gotulitedovolen.rf.gd/o_poder_da_esposa_que_ora_livro_de_oraes.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_off000140e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E3 5304 bytes
SHA-256: 181ab86b64d49bb725cf90f59c0cea1f893660fe17b1efea1b57c8d5ba64c469
font_01_sfnt_off000152db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DB 11172 bytes
SHA-256: 693009f980154ffcc70c8b69a972cb05181e15c03ada768422df1f559cbe31ca

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