Malicious PDF — malware analysis report

Static analysis result for SHA-256 33de26ab7a5f816d…

MALICIOUS

PDF

82.6 KB Created: 2021-03-14 08:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 445da9f955a5be142fd7890a8858fa27 SHA-1: 7d1d5573865c80ca3ad6ef2e97a73d4eec4b4a9d SHA-256: 33de26ab7a5f816d9ed67e25874aa1915266d1def5581651540cfbab9740a332
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a keyword related to freelance design charges, which is likely a lure to direct users to malicious sites.

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://botokaw.ru/wb?keyword=how%20much%20should%20a%20freelance%20designer%20charge%20for%20a%20logo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fcb763348238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470391/normal_5fe5a291ebc61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_6035b867d0978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458824/normal_601f1fe970d0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448558/normal_5ff759a7b6dc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408864/normal_5fddb204596f2.pdfIn PDF document text
    • http://itravelgr.com/givonokapomupezazs57t.pdfIn PDF document text
    • http://dizanuvusawowi.22web.org/apertura_inglesa_gratis.pdfIn PDF document text
    • http://akb54.ru/the_little_prince_english_book4t8dt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460463/normal_5ff8a60523b89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_5fe690f5ccccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_602f7e011c59a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_5fe8ede4199f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370269/normal_5ff3e9d209d15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c44c20-ca94-4cd3-865e-95772e4601f5/3-2_angles_formed_by_parallel_lines_and_transversals_practice_b.pdfIn PDF document text
    • http://mapesag.epizy.com/91773532974.pdfIn PDF document text
    • http://dorerewilaf.epizy.com/40129339520.pdfIn PDF document text
    • http://muwiliwus.epizy.com/ohsas_18001_audit_checklist_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34da22e-abcf-40e2-9bb5-73eac0de9c63/59300350048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4625bed8-fa08-400b-9523-9ff92f556fb8/sony_xplod_stereo_52wx4.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_off000105f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F0 5488 bytes
SHA-256: 1b0c8f74362b23c5c8c26e1302d6c9f509d540cf13379cccf88cf8b4d5c939b7
font_01_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 10708 bytes
SHA-256: 6eb928ac1df9d73daa2808ce3844dc628059568eee2571ed0304d521599795bc

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