Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dd2563418bf34e…

MALICIOUS

PDF

69.6 KB Created: 2020-12-29 17:53:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 345efa5ddc885c0e21add86c6ef02701 SHA-1: e949d7501cc28686b329e2ed9f2974793daa671b SHA-256: c0dd2563418bf34eec56923194d5e960defe03bdaeeff486c6334fb64b2b7087
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text suggesting a lure for a 'healthy diet plan pdf download', which is a common phishing pretext.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=healthy+diet+plan+pdf+download In PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/pimaxigumafox.pdfIn PDF document text
    • https://peniwomafases.weebly.com/uploads/1/3/4/7/134705361/7229983.pdfIn PDF document text
    • https://suxuwimuwudex.weebly.com/uploads/1/3/4/6/134641155/3329511.pdfIn PDF document text
    • https://dofonumid.weebly.com/uploads/1/3/5/3/135314870/dalisalo_waravovesefi_rixofuzebete.pdfIn PDF document text
    • https://raguwamirib.weebly.com/uploads/1/3/4/6/134630778/2030143.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/8693346.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470833/normal_5fe3ef0278da4.pdfIn PDF document text
    • https://vogadebu.weebly.com/uploads/1/3/4/7/134723944/labasopugivedo.pdfIn PDF document text
    • https://menaxogem.weebly.com/uploads/1/3/4/4/134432074/xexipeba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_5fd153364b3d6.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/f6e54b92-2de1-4b09-a937-6e1de7664af7/pabucumun_ajan_2.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/make_your_own_dotted_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c39acc29-fac2-465d-968a-0df873632060/tales_of_vesperia_flynn_battle.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/84799610190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13796c17-6f39-4e65-8ba0-634408c75c02/velifo.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_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 5012 bytes
SHA-256: 4335b06a9468fffa24ea2dd9b8e2afe63a81d279f485f583920566c6ec57df5a
font_01_sfnt_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 10224 bytes
SHA-256: a10654bdcc6890d3d9e70684d48f45e80e86fdf7da4f1503b83551fc12ebe561

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