Malicious PDF — malware analysis report

Static analysis result for SHA-256 174d4b0d1b77b9d3…

MALICIOUS

PDF

90.2 KB Created: 2021-02-21 08:41:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5b1ddd3e22fa167150a367b4620bebca SHA-1: 0a8d360a590e127f328da0927a9b95ff317f4963 SHA-256: 174d4b0d1b77b9d332e25feef0b1dd7d63ce38d560126e3f04bfa0cb9803468f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains a string that appears to be a search query, further supporting the lure-based attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=who+played+pippi+longstocking+1988 PDF link annotation
    • http://reduslim-sitoufficiale.site/games_cheat_codes_for_android_and_iosz2iia.pdfIn PDF document text
    • http://begemotiks.fun/dijokusizulosonebevepahuzu0.pdfIn PDF document text
    • http://card2card.live/certificate_of_deposit_account_balance_sheet140ir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fffc0e893fb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_602f13342ffab.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/Yl1Xidb/cat_bird_game_walkthrough.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5fcdf7949518a.pdfIn PDF document text
    • http://magnetfix.store/bukudelawilosuwak5re.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_602c33649f01f.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WMsBOd6/52328452624.pdfIn PDF document text
    • http://clubstore.pro/widelevay0vqa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_5fd5f812dd77c.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/f4jcPqT/chuteira_de_ouro_europa_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5fe0fd781bdfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 5820 bytes
SHA-256: 58f5aab4e33eef3a34070a22f4c6a10762027aa9107b7a7075f10af0d422b35d
font_01_sfnt_off000134dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DD 11612 bytes
SHA-256: 1d4ceadfd8d577030ed6b61062e054b3cb5c0f970c61f79ed4ce8f717c03508c

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