Malicious PDF — malware analysis report

Static analysis result for SHA-256 211a109e4d757ce5…

MALICIOUS

PDF

113.6 KB Created: 2021-04-21 10:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7ad8355c96ff89532df722115181e21c SHA-1: 0cddd230cef9bafe1ba0e5856d0730358decaf37 SHA-256: 211a109e4d757ce596ad3e26e7629092d680ed180b5a680657aa33183c7237a5
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, suggesting a phishing or SEO poisoning campaign. The PDF's structure and embedded links are consistent with attempts to drive traffic to malicious or low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=weaknesses+of+grounded+theory PDF link annotation
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://rubka.space/future_perfect_continuous_tense_worksheetvexu7.pdfIn PDF document text
    • http://iranomics.com/briggs_and_stratton_450e_series_carburetor_for_saleym3ox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_6013ca9bf0f16.pdfIn PDF document text
    • http://warajuvevuv.medianewsonline.com/mathematics_book_for_gate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_6022611420b60.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/bivinodusaposa.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/jbYgjYP/sunavizowupom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_600fb5280c256.pdfIn PDF document text
    • http://sokfresh.fun/chapter_13_forces_in_fluids_answersr82hv.pdfIn PDF document text
    • https://cdn.sqhk.co/dixobiwi/OOhdhb0/27017167265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409394/normal_5fcafc8d0ec22.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/Z0qia5Y/27070114378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486190/normal_602f8b1f342e0.pdfIn PDF document text
    • https://xofiwilo.weebly.com/uploads/1/3/1/4/131453946/vizirifupegavam-gabopuris-padufa.pdfIn PDF document text
    • https://xowavexinoj.weebly.com/uploads/1/3/1/4/131408618/suwafaratulazuzulagu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevikokuzufos.epizy.com/24305086593.pdfIn PDF document text
    • http://nalejunubotuw.rf.gd/rodawabivuvivoxiri.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/the_passionate_shepherd_to_his_love_explanation.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_off00017f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F1C 5316 bytes
SHA-256: 7b44a8d75f3f2283e0e69d046a3bff272cd757fe8518631f8f947ca0a9c669c1
font_01_sfnt_off00019144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19144 11848 bytes
SHA-256: b366305f916a5fd860b6dfd5155d1ed7f8159db4920e0f95875b3c545f101b15

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