Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb073143879190c…

MALICIOUS

PDF

77.3 KB Created: 2021-02-22 14:40:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0f0b49eaffc52f9ebcaf5bca09e56e8f SHA-1: d3931f75e148610fd619222c7209a527c551b12c SHA-256: 7bb073143879190c1558b7589e315ed5a1ff086b1ee78fb52902afbe3acea9f8
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, suggesting it functions as a link farm designed to redirect users to potentially malicious websites. The presence of external URIs and the overall structure point towards a phishing or redirection attack, 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/strik?utm_term=walking+dead+graphic+novel+summary PDF link annotation
    • http://fenijazefak.22web.org/61594451498.pdfIn PDF document text
    • http://gotexewadegu.iblogger.org/agbebolo_lyrics_by_celestine_donkor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_6022d26a209b8.pdfIn PDF document text
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/zelip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_60336f0b40c3e.pdfIn PDF document text
    • http://clientbluebadge.com/xukuwiwb1pz1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_5ff589fc87bc5.pdfIn PDF document text
    • http://salonapp.xyz/how_to_wrap_present_with_thin_ribbonqbtqx.pdfIn PDF document text
    • http://interplast.ru/17770673047r3l1g.pdfIn PDF document text
    • http://viwimewi.22web.org/31317949053.pdfIn PDF document text
    • http://site-shop.xyz/google_sphere_sheetwied8.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/fd5de0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ritajexebezix.epizy.com/sojitinivo.pdfIn PDF document text
    • http://maguvotu.rf.gd/anencefalia_embriologia.pdfIn PDF document text
    • http://datidogebe.epizy.com/44678251797.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/finnish_passport_photo_guidelines.pdfIn PDF document text
    • http://lofetumavigasi.epizy.com/medicinal_chemistry_textbook_free.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_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 5724 bytes
SHA-256: ab4d802e05f42012426f610b7acd355bcb4f3b5e700e062bf85b8757b2adb68f
font_01_sfnt_off000104ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AC 10496 bytes
SHA-256: 6d3d3b060fab4281697dd0fbaff33dde0b3841b691204db0585d863341810646

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