Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f81e0c3ec6a4748…

MALICIOUS

PDF

80.0 KB Created: 2021-04-07 19:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bdd02aff35f7566f4d816aec2899fc82 SHA-1: ce4c06a2c6b22d04e1152ab7ce963ce91b12f145 SHA-256: 8f81e0c3ec6a4748fe55f81ee035dd43115ce91c9ba6a105c3409cf0752759ad
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many URLs pointing to other PDF documents. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous external URIs strongly indicate a malicious intent to redirect users to potentially harmful content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

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 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.
  • 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://leonvi.ru/strik?utm_term=stephen+king+it+movie+2017+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379476/normal_5ffcf3d4ed2db.pdfIn PDF document text
    • http://zomesotemaxage.66ghz.com/45975062055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_605597dfd66ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472213/normal_600bcb8149b89.pdfIn PDF document text
    • http://wemepena.iblogger.org/oster_blender_walmart_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezazavu.rf.gd/is_there_a_free_version_of_minecraft_for_mac.pdfIn PDF document text
    • http://nojodesara.epizy.com/aguinaldos_venezolanos.pdfIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_b8d2055a8ea94a44ad9d571818faf565.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/crowdsourcing_platform_freelance.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/how_to_do_guitar_songwriting.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/sat_vocabulary_list.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/gasupozekewiw.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/vifiw.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/cherry_blossom_tree_images.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/61891449591.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/xogegerafon.pdfIn PDF document text
    • https://22e44a25-5b44-49ab-8bd1-9de78d2943b2.filesusr.com/ugd/cce535_da2cae5c6c0242da85f62021d65624c2.pdf?index=trueIn PDF document text
    • http://xajizufobuvofo.epizy.com/half_life_2_source.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_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 5540 bytes
SHA-256: ace6e631f6a61f7aeec7b3079537fd72ef6dfb988a4d14dbbd21776efe2c481d
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 10716 bytes
SHA-256: df6c6d41b81d055bd10252d9cdbe93bfff082d49d40afb496f42118684e60d39

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