Malicious PDF — malware analysis report

Static analysis result for SHA-256 659736e5ad720517…

MALICIOUS

PDF

113.3 KB Created: 2021-03-15 13:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a461c6fd8e2bdb4cf237841c74d4923f SHA-1: 4cf08db30b29bd04b8689cc644a1a5cb3e65face SHA-256: 659736e5ad72051730605b5c840eee18b5321415b0333691a570b6c29752044e
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 benign-looking PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a mass external PDF link farm, and another critical heuristic flagged the file as a 'Pdf.Phishing.Trojan'. The primary malicious URL identified is vilenefex.ru, which is likely used to host a phishing page or distribute further malware. No scripts were extracted, but the PDF structure and heuristics strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://vilenefex.ru/strik?utm_term=tokyo+ghoul+why+does+arima+have+white+hair PDF link annotation
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/5866683.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5fc8c1881ef72.pdfIn PDF document text
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/gigep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492588/normal_5ff096364c675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_5fdaf2d8483bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380380/normal_5ff9cf1e38af0.pdfIn PDF document text
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/xalemabosikawuv.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/4575219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448328/normal_6031310b3634f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/30966312266.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_533b7eca19e44ff5b9968cd6c1852f2b.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_729b45b00b514e19a22d495b76091ef2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/43883030923.pdfIn PDF document text
    • https://8459f3b7-b2e6-4b58-af31-5f29adf293b7.filesusr.com/ugd/a68450_6f4afc9b4a4042ed8f410313f2ead7f4.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_855a5a80ef8747d5a3885227ba23f21a.pdf?index=trueIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_ab576c4c91a64923b03fbdc9112fc305.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_a3db0520e63d44e1874cb23fcdd511f4.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_f92d3b4cb9b54bf48f446f093287864d.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_adb7f552b9c940c0922d4a43848ef60a.pdf?index=trueIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_89478853a4b546d59fafc824f7d432e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/norcold_refrigerator_manual_n621.pdfIn PDF document text
    • https://dde0dd8a-3973-4c49-894c-8116859bb8ab.filesusr.com/ugd/69695d_157c6077497d404fb65150993dbe2c6f.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_4e75536387084be490dbceec8d7cdee7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/48949306280.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/mewigixaretom.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFA 5700 bytes
SHA-256: 9d82776275b9cb8e75d45c0f6fe1b91c4840de531186e8473a5dc1853ad396f8
font_01_sfnt_off00016f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8F 5508 bytes
SHA-256: 74e398c59bd7262fd63904f226926f2fd8a0697dd4e1aed7b1d1217a6383b51a
font_02_sfnt_off0001823f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1823F 12296 bytes
SHA-256: 81145e260cf5e8596fba65c92c262a3ba9645b27599f892df6e2ee3ada122f0a
font_03_sfnt_off0001aaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAF7 2972 bytes
SHA-256: b278f9f2cd7b8ba589e022f9586814c222f4ce1565fa0e09d2963af7991d9a6f

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