Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c30a1cb1a3312b…

MALICIOUS

PDF

77.9 KB Created: 2021-02-26 14:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 29a323a3a0837f40b21907296fd8d36b SHA-1: 78a4401a4f5383ed58d742e59cdc1f168afac767 SHA-256: 84c30a1cb1a3312b74b33ad7bdca1f08ca098ab98ffc33562be94d88cf9d38e7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, rather than direct user interaction within the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=what+are+the+different+types+of+structures+found+in+sponges PDF link annotation
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/mipiru-mafasuvev-rajegabul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5fe47b458a56a.pdfIn PDF document text
    • https://gozulisob.weebly.com/uploads/1/3/4/0/134012313/6f565f4b45c84.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/1406128.pdfIn PDF document text
    • https://gebezemimubitup.weebly.com/uploads/1/3/1/0/131070169/nasufekolul.pdfIn PDF document text
    • https://fejavemupim.weebly.com/uploads/1/3/5/3/135314508/84f2591.pdfIn PDF document text
    • https://vodefuba.weebly.com/uploads/1/3/4/6/134688083/nutur_penogoxad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_60070502aa05e.pdfIn PDF document text
    • https://nudozulewofofij.weebly.com/uploads/1/3/4/7/134711849/6889365.pdfIn PDF document text
    • https://lanudoda.weebly.com/uploads/1/3/2/3/132303217/8320500.pdfIn PDF document text
    • https://zejikato.weebly.com/uploads/1/3/3/9/133997407/56e079b8798.pdfIn PDF document text
    • http://pixell.store/bally_sagoo_noorieee2u2.pdfIn PDF document text
    • https://soliduratop.weebly.com/uploads/1/3/2/3/132303261/22812.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/bedemodulo.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/mutalamivu.pdfIn PDF document text
    • https://zopatiselinijil.weebly.com/uploads/1/3/4/7/134758238/volik_badakaz_tizudejavuga.pdfIn PDF document text
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/dovakevutulino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530910/normal_6032745851644.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70B 5380 bytes
SHA-256: 0b4d25c33776d00b9bd5bc377de45aba0d4a53bc13494d1937fa8bfd34b74b8b
font_01_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10064 bytes
SHA-256: 9ae23b04d2a703b5d2376034b56f877764abe3ff7debbcda4734f682c2f5c7c3
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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