Malicious PDF — malware analysis report

Static analysis result for SHA-256 485a35ae8d145567…

MALICIOUS

PDF

101.3 KB Created: 2021-02-17 04:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 98775a300eb93f30f579641010e8fd7f SHA-1: f53833f6c1dcafb7d072b1b96d1a7abb5529d279 SHA-256: 485a35ae8d1455671c0ea36524aff7a6d284c694291ede55479b865219833021
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous extracted URLs suggest the document functions as a link farm, likely directing users to phishing sites or further malware. The presence of multiple disposable domains and UTM parameters in URLs reinforces this assessment.

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://baarspo.ru/strik?utm_term=do+pisces+play+mind+games PDF link annotation
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/5853662.pdfIn PDF document text
    • https://rikizanasurixa.weebly.com/uploads/1/3/1/3/131379420/2ba97e913e93ad3.pdfIn PDF document text
    • http://vas-rem.ru/669319120699nylk.pdfIn PDF document text
    • http://testersairf.xyz/kudejonobenebetutubucqq1.pdfIn PDF document text
    • http://webdefilmizle.com/capita_linguist_timesheeteshr0.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/cgf7igQ/71222407858.pdfIn PDF document text
    • http://tehnotop.space/4321353164935v8q.pdfIn PDF document text
    • http://xxlmature.site/wejobunepemavenafaqbtsy.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/3921023.pdfIn PDF document text
    • http://copytoshka.ru/volume_of_rectangular_prism_worksheet_free3r64d.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/pipem_labim_tilunutobodo_larexekogevil.pdfIn PDF document text
    • http://arendagg.xyz/fesuzolunetujasedigkdl0t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5ffd9e3b373e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gifiz/lokis.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/steamapi_init_0_failed.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_off00014fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD5 5396 bytes
SHA-256: e1be2e5d118c1e0d86474cc8612b7e67cfbd5f13443eb78c623dabe31890f0d8
font_01_sfnt_off00016233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16233 11216 bytes
SHA-256: 55c57467128203946955e1e6b8fc6978a6a638d9842367d9fef9f64492cb5ca6

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