Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5f3cff49e590b0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-06 16:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6225a0c1a43a6ef6db930da1d49496b3 SHA-1: 4fbafef5c14e5cea962b1a3150dccb9e455306e1 SHA-256: 5d5f3cff49e590b0456c104c3ef89b6a500928cee42805991ec79c1dde61dd63
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure suggests an attempt to redirect users to potentially harmful content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://druttle.ru/strik?utm_term=two+way+radios+ebay PDF link annotation
    • http://digitalcalakk1.xyz/jyotish_astrologia_vedica9c8en.pdfIn PDF document text
    • http://xteenware.online/giorno_s_theme_saxophone_sheet_music17lnk.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/5803205.pdfIn PDF document text
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/lelikusokulokadabow.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/xifalikiro.pdfIn PDF document text
    • http://sollabs.xyz/falodaguxodnjap.pdfIn PDF document text
    • http://my-favshoph.online/tasepewataruros7typx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dekogamik/76387034391.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/webivasubaramobedunade.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/66806916320.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_57d8bb24533a4f8188dd060bf43939d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/earthwise_lawn_mower_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/afterlight_pro_apk_latest.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_e837b687ba9c40aeb490bbae010bc61d.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_4e434f2fcf1f4fd0a671d5169d055932.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_41736d2b682a49d3bb88e9cc0fd5ca6b.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_8fd0a604103841f9a23b6aa0faf17a0a.pdf?index=trueIn PDF document text
    • https://3a5aa097-47f9-475f-9992-83bceef25cc3.filesusr.com/ugd/f55bec_54a51498f30b43368ad62edc5578ff93.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/74622942296.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_8e2554f60ce44867a2029427f29ed8b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/66419614137.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_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 5068 bytes
SHA-256: e64819fc1f4d84136f5afc3de70d13f9fc59d41c00e25d7b74b69d556b843db3
font_01_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 11512 bytes
SHA-256: 8f14f4319cb640129e063254719a440714ce5cd4f6ba0eb819b026bc73392cc2

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