Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ec4b60348da568…

MALICIOUS

PDF

108.0 KB Created: 2021-03-20 23:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 165cdde9afc10b9edfbf91a90e881afd SHA-1: 8855e4057dca8d39b9bea0239c1059a5c3c073e4 SHA-256: 66ec4b60348da56859bc5bbaed278fd0fd4b9bbf939d091e6abcb9ba58482bdd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a critical heuristic firing for PDF_SEO_LINK_FARM. The embedded URLs, such as 'https://soxebez.ru/award?keyword=dna+uptake+during+bacterial+transformation+pdf' and 'http://kemamibuke.mygamesonline.org/guvelaverisujodezowevuv.pdf', suggest an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://soxebez.ru/award?keyword=dna+uptake+during+bacterial+transformation+pdf PDF link annotation
    • http://kemamibuke.mygamesonline.org/guvelaverisujodezowevuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fd3553369a8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373983/normal_5fc59e1ff2936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fe8ec5a21820.pdfIn PDF document text
    • http://mawiratuwulu.iblogger.org/bible_commentary_old_testament.pdfIn PDF document text
    • http://wubujogulekaf.iblogger.org/23724168819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_6015221531490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408595/normal_5ffcdd09ad17a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_74e984c88aa048ee91d9d55410dc4845.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03828e09-3e71-4dd8-89eb-98205e2eefbc/siseta.pdfIn PDF document text
    • https://fac7854b-22c3-40b9-bef9-ee94a55a010d.filesusr.com/ugd/fba82c_8a6bfe1ea1b7456ba8bb47234dbb5eaa.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_77839012d60f40e684377cdbe4a56959.pdf?index=trueIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_96db8f4e33b34842a202fea407a1673e.pdf?index=trueIn PDF document text
    • http://jomupaz.myartsonline.com/sentinel_gun_safe_key.pdfIn PDF document text
    • http://wewefaxekedafoz.epizy.com/ukulele_sheet_music_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e8f572-d621-42d6-8482-430bafec05f1/80325678134.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_7e540797b8f74b70a893c0b895f5b2f8.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_c49cf07f35594964b190cc598cef1063.pdf?index=trueIn PDF document text
    • http://fazovalekotevo.onlinewebshop.net/synonyms_and_antonyms_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73e3ea7-ca01-4ea1-870a-0cb1121f4434/keduvabetebigovenazijap.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_1e126cedfe61478fb273113c9bc39f11.pdf?index=trueIn PDF document text
    • http://guvubaxi.epizy.com/fazer_backup_android_para_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d50b5fe-a659-4e6e-a631-622c77e84cb2/pumabu.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_ea3018094822459184d9d5d6bc343993.pdf?index=trueIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/85690069600.pdfIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_00d4d23aa75a449f82d222e4eef5c6da.pdf?index=trueIn 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_off00016378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16378 5680 bytes
SHA-256: 60dd8971c75eab368402f81793cd1c4f39b1148b58d58a1096611219e40d02d5
font_01_sfnt_off000176ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176BA 13480 bytes
SHA-256: 74a1d4c5117196a4088353b72f1cc1362212f239816d6900b30fefc82a80f3bf