Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4c9543cf2bcc58…

MALICIOUS

PDF

83.3 KB Created: 2021-05-15 07:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6e531c9593f32303b60a5867d2ca9726 SHA-1: 265bdcfb6d74f417f9815d4924ed4402d95a5d00 SHA-256: 7e4c9543cf2bcc58119abadd5a42a58c2bffba78ea598e769b80eee9bf8f2734
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains and using UTM parameters, suggesting a phishing or link-farming scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the sample's nature as a link farm on disposable hosting, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/strik?utm_term=animal+which+can+live+without+oxygen PDF link annotation
    • https://cdn.sqhk.co/mupalewefe/shaKgeC/92149495009.pdfIn PDF document text
    • http://jobesagaponapa.22web.org/the_art_of_reasoning_david_kelley_free_download.pdfIn PDF document text
    • http://betflixguvenilirmi.com/18471069161hoam6.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/46262506541.pdfIn PDF document text
    • http://bukudix.getenjoyment.net/ableton_live_9_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/d1jfNB4/66857634976.pdfIn PDF document text
    • http://dreamingdeveloper.com/vodafone_postpaid_cancellation_letter_formatlpd8e.pdfIn PDF document text
    • https://cdn.sqhk.co/divoxisig/ilsSEWs/cartoon_spring_boing_jump_sound_effect.pdfIn PDF document text
    • http://tryporte.xyz/english_activity_worksheets_for_kindergartenotav8.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/bigipudesikebugezizo.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/30622726887.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/lot_s_wife_anna_akhmatova.pdfIn PDF document text
    • http://english-10.site/7028980637758xom.pdfIn PDF document text
    • http://latencfsrt.space/rogue_lawyer_john_grisham_summaryesv7n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitojedakolotil.rf.gd/neptunia_rebirth_2_true_ending_guide.pdfIn PDF document text
    • http://tejizikadojuni.epizy.com/36901470589.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_9ac396686b9e4212a788d25c1b07be9b.pdf?index=trueIn PDF document text
    • http://rofumuramim.epizy.com/english_to_spanish_dictionary_app.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_4265e7bb901e4b398f1661d6a746222e.pdf?index=trueIn PDF document text
    • http://xijuroluzuka.epizy.com/tupepaboraposazijubu.pdfIn PDF document text
    • http://kawanasigupezin.epizy.com/what_food_is_gluten_free_at_panera.pdfIn PDF document text
    • https://6e6ad6c0-90f2-4367-a025-4e24aeda1d0e.filesusr.com/ugd/c9b7fc_eb60eda62fdc41dc87e78f857c0532ca.pdf?index=trueIn PDF document text
    • http://fafezevasuba.rf.gd/43617992106.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_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 5252 bytes
SHA-256: 13f4404d207f2d0bdcdd06047a13d7cca653b08ab3048e2f932753c95df41077
font_01_sfnt_off00011b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B94 10584 bytes
SHA-256: 076d3cdfde21278363aed3ced49ff7601a626da209f9ae79bd7c6cedf4702544

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