Malicious PDF — malware analysis report

Static analysis result for SHA-256 085b024940611f11…

MALICIOUS

PDF

76.1 KB Created: 2021-02-25 18:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 91fb62b45b80a63fcf90e983a557fbdf SHA-1: 4f839f42f47b84f65c8357d6cf80e4486f3f6f6d SHA-256: 085b024940611f1117e12b6074f9cae2d9a49883cf76451ebc51690df448d599
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a URL seemingly related to a 'lifetime fitness family membership' search query. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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://druttle.ru/award?keyword=how+much+is+lifetime+fitness+family+membership PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373008/normal_60155a4b7fc2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fe705e141eb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5ff7099f49f44.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/hygeihY/kizufesaragazizerek.pdfIn PDF document text
    • https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/laxetogaruwugatuki.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/icKmXCo/jarerotejebilumap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_60135cf957d10.pdfIn PDF document text
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/pewuzejure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5fcc61135d9ed.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/hjljijj/75508452677.pdfIn PDF document text
    • http://mipuwuse.22web.org/lagu_addicted_to_my_ex.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/602jhih/knight_rider_kitt_car_for_sale.pdfIn PDF document text
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/vawama.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fanunif.rf.gd/lozatuwaxojefom.pdfIn PDF document text
    • http://wonuzewidej.epizy.com/blue_line_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/84216159658.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/everybody_wants_some_imdb_parents_guide.pdfIn PDF document text
    • http://jisuwexadik.rf.gd/cephalosporin_mechanism_of_action.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_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 5552 bytes
SHA-256: 8ede9612146da1bea5eb613952eea978ed9d578a5264f8170111d7074b0e4386
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10476 bytes
SHA-256: 015a03dd72e39fdd6bd19f2766c3e0144945226bd1df6d9b7e5f169c68e262a4

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