Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b826f71f9234d3d…

MALICIOUS

PDF

94.7 KB Created: 2021-05-28 22:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2bf83874c8cfc66c6cfd8810c504f045 SHA-1: 55bd29c0a3d471650bca9b7ee46c13e5f3daec48 SHA-256: 4b826f71f9234d3df1da21b0d213dcfc3b172807479a5cd56e669053bad9897d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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://jottigo.ru/strik?utm_term=how+to+use+a+drill+master+trim+router PDF link annotation
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/vojinalofozaseb-sutuduva-dubaginuwuf.pdfIn PDF document text
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/efa8a8f0e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_5fd1f75cf06d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_6018601919356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5fcb388ce11e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_6054fa70e4bba.pdfIn PDF document text
    • https://gejeximiba.weebly.com/uploads/1/3/4/8/134897602/ece50378.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/nugogawuben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_606e5dd1a109a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468259/normal_5fde88e8b5825.pdfIn PDF document text
    • https://duzopuxezofuj.weebly.com/uploads/1/3/1/3/131382696/vegijosujegejezen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478132/normal_6031752da407e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_6025e4d7e1d23.pdfIn PDF document text
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/ddb5d4.pdfIn PDF document text
    • https://rixapozati.weebly.com/uploads/1/3/4/4/134456921/lagagekedevub_musaxatad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_600c6f0e728de.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 5024 bytes
SHA-256: 57c599311fdecac8247611e5f105e18ac8362cc42af4d89dd8b7cade026131cf
font_01_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 11684 bytes
SHA-256: 4efab3055bcb853783a4ab06ca824779f24e7101294c3585b4593738794aab23
font_02_sfnt_off000155e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E9 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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