Malicious PDF — malware analysis report

Static analysis result for SHA-256 841a26474f20d93c…

MALICIOUS

PDF

72.5 KB Created: 2020-11-19 00:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: df7364204bee2d40b3237c767afe88ee SHA-1: 13132a4cf7745c98eb5f22f4bc2448e4328c20cf SHA-256: 841a26474f20d93c7729cc909a9721f2d9cab08f53d603117f3b0175b69eac63
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://traffset.ru/strik?utm_term=tom+and+jerry+baby+puss+wiki PDF link annotation
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/ef232c275e94.pdfIn PDF document text
    • https://noxurujoba.weebly.com/uploads/1/3/4/3/134384046/wumafa.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/nugedub.pdfIn PDF document text
    • https://nutuneronasida.weebly.com/uploads/1/3/4/2/134266022/1893663cda58274.pdfIn PDF document text
    • https://jenogadagebaz.weebly.com/uploads/1/3/4/5/134586404/pufogumemal_dajuweziruvis_kevegotitiberud_fokusebusofazin.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/liwadanuja_risemiber_ginodadalop.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/6b70bb8426fc7.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
    • https://uploads.strikinglycdn.com/files/976b91f6-c040-48da-b6d0-4f58bc4626e1/94967377146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255a8403-3314-450a-ba4f-7f9475f9bb9a/gikimeso.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/lokokawepusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a829a07e-c048-4973-9346-de17e289e771/maus_book_2_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7268606a-149a-4a0f-b58d-4ef3d16cdce2/98217343314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5962f7cd-b186-4c69-8fd9-f6d9df1302ff/kasopuk.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/76840349800.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/44936655424.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/balun_canan_english.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10B 5296 bytes
SHA-256: f32b107f050fc38c568567a971b1fa1ae02d10cd4c0df1b7e966bf54a1d9351a
font_01_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 10628 bytes
SHA-256: d2b0c2f0db55ae687905de30269ee2da5a5b060273699fb5c85554433c30a8b9
font_02_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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