Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e78df79b94acad…

MALICIOUS

PDF

99.2 KB Created: 2021-03-14 13:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fa949674d2e8867934576f69780791f SHA-1: b82e157a63edb4aa557eb1851e36c9fb5c01c34f SHA-256: 10e78df79b94acad285bcdf6c4f64bf380babccb750e4d845ed2d5b79ca20535
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. While no scripts were extracted, the presence of numerous external URLs points towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=mathematics+dictionary+english+to+marathi+pdf
    • http://dedekuwetom.iblogger.org/jonudavaxupijapakowa.pdf
    • https://cdn.sqhk.co/jaxabofapuw/a4hiKig/62489032158.pdf
    • https://cdn-cms.f-static.net/uploads/4414352/normal_601d87b25f2b0.pdf
    • https://kabulemumolitu.weebly.com/uploads/1/3/4/8/134869515/majonamuw-jadavegovakeduk.pdf
    • https://cdn-cms.f-static.net/uploads/4379471/normal_60327f7a9daa1.pdf
    • https://static.s123-cdn-static.com/uploads/4393348/normal_60015ead8c8a8.pdf
    • http://xexudoj.22web.org/samafufabelupelopitedifoj.pdf
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/girebituzomuzat.pdf
    • https://static.s123-cdn-static.com/uploads/4454435/normal_5fcb97971de04.pdf
    • https://static.s123-cdn-static.com/uploads/4414860/normal_5fc89d946b8a1.pdf
    • https://cdn-cms.f-static.net/uploads/4450430/normal_604834768f691.pdf
    • https://gevoxegugajaber.weebly.com/uploads/1/3/4/6/134668378/kaligature.pdf
    • https://cdn.sqhk.co/foxinukepo/fdR4hfF/99002704467.pdf
    • https://cdn-cms.f-static.net/uploads/4379731/normal_601daf6984a1e.pdf
    • https://cdn-cms.f-static.net/uploads/4375522/normal_5fdb9a620cc4b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • http://kifozelig.epizy.com/sebapogikazanewera.pdf
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_8cc499e9091246e5b31057547a8732ff.pdf?index=true
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_e648c528951f461ab3b6c64705be8266.pdf?index=true
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_01e8d2bc07b440e5a095943783c6be14.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5b.bin
7ada5a8df8cc2437e08b14eaa815233e031d02a2b9a3b01ccaa307493ec835ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 5464 bytes
font_01_sfnt_off000110d4.bin
e9618cf14480f733dc2c24183ce8e9a393155d81506a4854a3075a00e5627f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110D4 10584 bytes
font_02_sfnt_off000134f2.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 4324 bytes
font_03_sfnt_off000142f3.bin
ab622875430e7ab935d9a08f7b533ccbd9b03b0f085f4e94c6dd2dd6b9bd4723		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142F3 19932 bytes

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