Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fb7749fde2cf5b…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 21:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 46c305689bb7df61fe32a58766f04991 SHA-1: 593b86dcf160d78583e985de5e0d0738f2ca87e9 SHA-256: 90fb7749fde2cf5be4e20470fe2ba1405a7f0f2452e6174fc67c40ab346f5d1f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/123?utm_term=pictograph+worksheets+free+printables PDF link annotation
    • http://axacheat4.xyz/pompe_funebre_lefebvre_grandvilliers1uxo7.pdfIn PDF document text
    • https://cdn.sqhk.co/tipadasa/jeKKHcv/kepemetesimuzefesubipi.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/ramonujes.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/jgHi3NK/batubekusanuruwonebin.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/jehejdl/jewelelalomozajewifawid.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/UibBtgc/tubal_ligation_side_effects_hormones.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/dewemotujal2vfi7.pdfIn PDF document text
    • https://cdn.sqhk.co/dulunukosep/wghdjcm/94661845106.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/cUungdl/sudubil.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/NjdrJ4T/56324376400.pdfIn PDF document text
    • https://cdn.sqhk.co/kupujape/ih1iUBQ/manual_cuff_blood_pressure_monitors.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/business_in_nigeria.pdfIn PDF document text
    • http://vapovalexuma.epizy.com/dovepuzajebun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c869d311-fcad-43f8-a411-60822ee0b6e5/what_qualifications_do_you_need_to_be_a_cashier.pdfIn PDF document text
    • http://podedubo.epizy.com/agronomy_of_cassava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b584309b-ac5e-400c-8070-91ee7199c5e3/22444957599.pdfIn PDF document text
    • http://xenadixajasole.rf.gd/dinigajizolujusozamemas.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_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 5576 bytes
SHA-256: 25073d9f2954b1182091b760ecee5ae636ca7c9680d20b4e0c36c856cf2a5b55
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 10600 bytes
SHA-256: 4bc0268c2e4d240a54d59ec3f17d5557587f5e0a51abf2a5ed58aaed733dcbe5

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