Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d5e57e52edb7c4…

MALICIOUS

PDF

76.0 KB Created: 2021-03-08 13:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d2c46c3f7ce664f40e4b6c2282740eb3 SHA-1: 2cc04204b7c26e8512ede38de75a7575c8f8d607 SHA-256: d7d5e57e52edb7c42b5c623ba621b8baace5ee8f378df5172d013892f3be4ce1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic, directing users to various PDF files, one of which is a malicious URL. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. The presence of embedded URLs suggests an attempt to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/123?utm_term=adzan+merdu+malaysia+indonesia PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495050/normal_5fe020b0552d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473384/normal_602d3feb23c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_601c9686b22d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404503/normal_5fe2f4a72b459.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/diferencias_del_modo_de_produccion_capitalista_y_socialista.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420260/normal_5fd38fba436a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_602170f19e6e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5ff39c31ae3a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_601d76f40d946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_5fd72932bac79.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/renodesojodujesuk.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/gapivegek/british_english_dictionary.pdfIn PDF document text
    • http://vunonam.atwebpages.com/78676635986.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/retofabakanubegonujisura.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/school_field_trip_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/43503070237.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/10313700677.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/the_scribner_anthology_of_contemporary_short_fiction_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/bloons_td_5_hacked_apk.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_db28882f227342a1bcf2eccdaccb663a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/mebuxowijulatuve.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/21403260747.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_e3c2c4ead5594a9f9d0629ba301bc1bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/android_studio_apk_not_generated.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_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 5112 bytes
SHA-256: 896cbc650a6d30b47b4d9f92ccf09a01a1d362f87bc058be2260ec87b962c78c
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 12132 bytes
SHA-256: 82f1e8330960cfdd1e6b3486196f77c213b808f81abf558f39eaf8e668593656

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