Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddad3163ed487e27…

MALICIOUS

PDF

75.7 KB Created: 2021-04-16 13:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4120079909542ec4185c95d8083881c1 SHA-1: 2396dd69c133797b5ad533db7650abc76265ea74 SHA-256: ddad3163ed487e27bf04e76bf8ac2f7417d3b45cae9e276061a44134332be4a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=what+is+discontinuous+development+in+child+development
    • https://cdn-cms.f-static.net/uploads/4369318/normal_60402fbe6ad1e.pdf
    • https://jipafedi.weebly.com/uploads/1/3/0/8/130813136/xamikinu.pdf
    • https://nejavedejelije.weebly.com/uploads/1/3/4/3/134336697/2293402.pdf
    • https://static.s123-cdn-static.com/uploads/4449793/normal_6005220bcb9b1.pdf
    • https://sovirufumidek.weebly.com/uploads/1/3/4/9/134902413/ebc2b5cd.pdf
    • https://cdn-cms.f-static.net/uploads/4412158/normal_6037b384c17bd.pdf
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5ff25a01a3f17.pdf
    • https://kavirozix.weebly.com/uploads/1/3/3/9/133999962/dupesizulaxodez_woziseradosatez_sifewole_jodobasem.pdf
    • https://wizenojozus.weebly.com/uploads/1/3/4/3/134319480/1597964.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_4571dc10ff8c42a88944e9ecd636fb9d.pdf?index=true
    • https://s3.amazonaws.com/wazotojemov/tonemujafasekofujifux.pdf
    • https://uploads.strikinglycdn.com/files/b0e1a0ce-253b-441f-bc01-b31bed45880f/tabowenugefetok.pdf
    • https://uploads.strikinglycdn.com/files/172f9576-7b8e-4b66-96a0-d6d161c46e8a/monuboponezelezelew.pdf
    • https://uploads.strikinglycdn.com/files/b0b931ca-f1b1-42db-88b3-0e0192745cd2/black_ice_key_and_peele_gif.pdf
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_54dcb2c98ed34c7094be1d28f77b6cbd.pdf?index=true
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_61d605ed9cb24134b7d2a5f48d5b2e93.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_4efd910a01ed47fb8bb0f1eadd2fabc1.pdf?index=true
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_32671ca064d9422696a820d18072ecbf.pdf?index=true
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_5c371a36c6644781afd96df4af7e0b25.pdf?index=true
    • https://s3.amazonaws.com/fajetufekejo/zizezomonerupametetefizal.pdf
    • https://s3.amazonaws.com/niwotipugonuvoz/what_period_was_pride_and_prejudice_set_in.pdf
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_e9823e845892482c806010b108794754.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea09.bin
cda700e39052d0aec18eb48eca006ec48b79e38999a06756cd13754117857131		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 5288 bytes
font_01_sfnt_off0000fbf4.bin
5236f958846975ab3a48eb9e8aebe1601ef5fcee09935db3ac0e13b3cff7e30b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 10984 bytes

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