Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16acf87dda9c80e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 14:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bbd786091fb3e0498095b39abd318129 SHA-1: 218469080d511cea74f69a138fed35020d427cd2 SHA-256: c16acf87dda9c80e4bd418560d0f1b1e9cf6f958ca92506cc25d7d7ba0f856f9
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=tecnologia+assistiva+para+surdos+pdf PDF link annotation
    • http://topsalon.xyz/how_to_pair_plantronics_voyager_5200_with_iphonex52ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_6051bef1674b2.pdfIn PDF document text
    • http://esmoney.site/vomuswlwh9.pdfIn PDF document text
    • http://airbin.top/28566779453uvv8r.pdfIn PDF document text
    • http://kugiriteno.iblogger.org/45355256187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_601a996f9e929.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dezinolabebosod.atwebpages.com/10024769670.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/affidavit_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/greenville_south_carolina_weather_report.pdfIn PDF document text
    • http://sexupoweduf.epizy.com/780212942.pdfIn PDF document text
    • http://sugototuvomek.rf.gd/67157354372.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/zajef.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_3010d9ffa7ca476fb72e77da984abfc9.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_88da08a2e91441f69136cc5deb3c13c7.pdf?index=trueIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_5dfe6a209f734b708c7c796244402e43.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/driver_printer_sato_cl4nx_plus.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/cul_es_la_dosis_de_metronidazol_para_adultos_250mg.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000111ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x111EF 16888 bytes
SHA-256: 3c2dc1000267042446b05e35270da19de597dc2b1d5e90c34eafbb079cd79cd9
font_00_sfnt_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 5332 bytes
SHA-256: 3f9bd062ebc31578d1ac8f9a09a443b798750cbcea82c619251f07cd13af47a4
font_01_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 12740 bytes
SHA-256: 5452c59205f9903ad35df28e2b02042be6e36975322ff8f86f4ca74a398e6912

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