Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9aee334ecc42e0f…

MALICIOUS

PDF

82.0 KB Created: 2021-03-11 12:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 93418ceddced527cd40cdb1a96fe2143 SHA-1: 25697f61cef413c01d1ad1beba1fa937077bf85b SHA-256: a9aee334ecc42e0f5204f511a6cb281f6b4b35e279ce7f61f05fbcba2838354c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with at least two pointing to suspicious domains that are likely part of a link farm or used for phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/award?keyword=amcas+applicant+guide+pdf PDF link annotation
    • http://rewita.fun/sql_server_business_intelligence_tutorialme9pc.pdfIn PDF document text
    • http://ruwulazitu.iblogger.org/66393547941.pdfIn PDF document text
    • http://molotkov.site/juzebojerajuvugupx5cxf.pdfIn PDF document text
    • http://on-arenas.com/ejercicios_para_aumentar_masa_muscular_en_casaiv84g.pdfIn PDF document text
    • http://expressday.online/the_communist_manifesto_book3ou20.pdfIn PDF document text
    • http://fherixq.com/59529433889gp4o1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumuwilonabili.epizy.com/koxujabajuzodaviw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0db5457-1e5d-4a85-bd4e-cffc151299c3/crowbar_vs_pry_bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e519c60-b41a-431d-8081-4c2cdd1bfb80/ht_ct780_sony.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/drama_entourage_sub_indo_360p.pdfIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_b0305ab6f5014bd9ad2195dda486c8cc.pdf?index=trueIn PDF document text
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_4a46c613441d4dab967994fca444a279.pdf?index=trueIn PDF document text
    • http://ruvilex.rf.gd/tenancy_agreement_word_format_malaysia.pdfIn PDF document text
    • http://refipazak.epizy.com/amrita_nayak_odia_songs.pdfIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_217946c7b24f41e1b116ac54a2a5d665.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resisuna/3d_shapes_worksheet_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/20104762682.pdfIn PDF document text
    • https://1dc14bb1-b35a-4a2c-8dd3-13bd966eaa8a.filesusr.com/ugd/70c1f8_2c106e6918814d68812f2854fc0af79e.pdf?index=trueIn PDF document text
    • http://tuwafexom.epizy.com/wiwewurebajavigezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57708849-b9a0-49e2-aa63-0a98bbfabf8f/mobiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2685fe0a-61a1-4c62-afcd-16489cd98d94/introduction_mathematical_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/62029034819.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/sales_visit_report_format_in_excel.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_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 5368 bytes
SHA-256: 847804e0fea2f67fc7dab4021bbb14b4a3225541dd5d562bc8cff6a4ad6ee647
font_01_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 10476 bytes
SHA-256: e51f428007a46fcb42d07eb5bccfa8d9fa967d7724b9477789d81240b89dead7

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