Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4158fb4f3bb3527…

MALICIOUS

PDF

90.9 KB Created: 2021-03-10 02:36:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b04011ff7c4e6f6d46277c37ead40e38 SHA-1: 754e63628c1729e9e55557c52b80875af9d4b953 SHA-256: e4158fb4f3bb35277fb41ed6a003ef2161739bed295c672a19766decab0e68db
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs hosted on disposable domains, designed to redirect users. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or phish for credentials.

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=rider+waite+tarot+cards+amazon PDF link annotation
    • http://rikafitamedad.medianewsonline.com/1487352261.pdfIn PDF document text
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/8161829.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/rerijuzidud.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/vasovagal_syncope_patient_information.pdfIn PDF document text
    • http://rodina38.ru/15036374365mbabh.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/are_ryobi_cordless_mowers_any_good.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/25032726004.pdfIn PDF document text
    • http://purubifo.medianewsonline.com/gifegisugeb.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/vaxugewoxufamakatulasa.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/how_to_change_delta_single_handle_shower_faucet.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/parubebuxudabafofez.pdfIn PDF document text
    • http://blancer.xyz/how_to_turn_off_ringer_on_panasonic_phonej8juk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogoxuf.atwebpages.com/what_are_burger_king_fries_cooked_in.pdfIn PDF document text
    • http://fisowafoz.epizy.com/77556985953.pdfIn PDF document text
    • http://zorarizasodefa.epizy.com/job_motivation_letter_sample.pdfIn PDF document text
    • http://susegutej.epizy.com/do_you_need_a_degree_to_take_the_fe_exam.pdfIn PDF document text
    • http://desejikunalele.rf.gd/temunakofokadofok.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/ethiopian_bible_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 17700 bytes
SHA-256: c8473465411416cf80b8854fdc710c4c71c705d5a0e7beefad0bd85f09b9e298
font_01_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 5204 bytes
SHA-256: 0e67ede0bba9a31128117797128a22677da223ea3cef10a9a9cae95af4e331e5
font_02_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 12100 bytes
SHA-256: 5f1c3d206d496738e8f8b8a5a5036b668a019735e564c4ab8745491101baf8b8

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