Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acc23787e900d54…

MALICIOUS

PDF

67.2 KB Created: 2021-01-15 01:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8179d8f8326f8658012f007b843197fb SHA-1: 96a772a41606a6da404e6ec01d475c83954e0dd1 SHA-256: 6acc23787e900d546518f42cce113b2e17a851b6a475122f5d6ec489f5483cb8
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafftec.ru/123?utm_term=360+divided+by+500 PDF link annotation
    • https://site-1208062.mozfiles.com/files/1208062/taguwupuxokewofigadu.pdfIn PDF document text
    • https://site-1221861.mozfiles.com/files/1221861/apk_emulator_ps3_for_pc.pdfIn PDF document text
    • https://site-1178372.mozfiles.com/files/1178372/rugisovanuvowu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fdd80462f2d1.pdfIn PDF document text
    • https://site-1178723.mozfiles.com/files/1178723/warship_battle_mod_apk_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f972630aaf99.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/rinefejatabezexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_5fa976e91e160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388815/normal_5fcf5aa553927.pdfIn PDF document text
    • https://site-1180295.mozfiles.com/files/1180295/vijiwerivunawu.pdfIn PDF document text
    • https://site-1172039.mozfiles.com/files/1172039/learn_to_speak_english_software_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_5fbb6dca60158.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/belopudevuzuza/critical_ops_hack_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/nefapasi.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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 5092 bytes
SHA-256: f9008ea7dd03338d66c60f8b360541def50bb5be8d7ecbe1dc582ef8b2060faa
font_01_sfnt_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 10848 bytes
SHA-256: 043f21dbaef99989760dd75832b26432ed98f9b72e180db83130c6f35474abf0