Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d0b8acafea51b9…

MALICIOUS

PDF

74.0 KB Created: 2021-04-18 17:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 32c1e657094ac8520a02750942ab0d77 SHA-1: 53f2ae92a0e23064dccb78e4bd75ae87e0adce85 SHA-256: 72d0b8acafea51b9619c0c746843f12e06e44367f4e9e9380403f3950720cf73
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 0.9997

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://midufefew.ru/strik?utm_term=siemens+hearing+aids+battery+size PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481520/normal_5fd0ec9d8967b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_6057e9708a83b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fca0b0eb7998.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_5fda4706b2038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456671/normal_6055664623509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_5fe8d07f543d6.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/danilire.pdfIn PDF document text
    • http://gekigowegijuvo.22web.org/xisukopop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tediguku.atwebpages.com/viniwikunurovam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a42897-7cda-4fe7-803b-aa8910b1d5e3/ratatagajegibozojapenuz.pdfIn PDF document text
    • http://zodofujeki.atwebpages.com/lalesubetipevukawid.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/persona_q2_art_book.pdfIn PDF document text
    • http://kelopemajidimux.epizy.com/animal_classification_worksheets.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/wopemim.pdfIn PDF document text
    • http://tevimumuto.epizy.com/ritawidewikefojuj.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/jadujekemerev.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/como_cambiar_el_formato_de_fecha_en_excel_con_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80208d36-2a3e-40eb-8ab1-bbfe66e393fd/does_roku_2_support_disney_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/37097643541.pdfIn PDF document text
    • http://jujodixawo.rf.gd/what_does_the_chariot_mean_in_a_love_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2003bf02-ef62-4f7e-9d6b-e3ce26b23db0/manual_impresora_hp_photosmart_d110_series_gratis.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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 5604 bytes
SHA-256: efb69555f3c94eb48b2272f03305f6992e40df15089eb121c2fb26a8b5139325
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 10180 bytes
SHA-256: 5c0734e67ae7092db505dcfe450a61668070f48af5607857720b1a17f9403bb8

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