Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d61a96b679b8f16…

MALICIOUS

PDF

91.1 KB Created: 2021-03-28 08:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57ade8e0d11980a683caef96d6026f56 SHA-1: ae95762810a37b85bf41254b97363d9bfb092265 SHA-256: 4d61a96b679b8f16953ec5a24763a208d4eb8ce2024cbc84233ff573a3c02919
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 hosted on dynamic DNS services and appear to be part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-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://botokaw.ru/award?keyword=disney+theme+piano+sheet+music+pdf
    • https://rosolivemimej.weebly.com/uploads/1/3/1/3/131382018/xepip.pdf
    • https://zobilajes.weebly.com/uploads/1/3/2/6/132682335/33561c37a15432a.pdf
    • http://nugomax.iblogger.org/fisiopatologia_de_la_cetoacidosis_diabetica_2020.pdf
    • http://niverokime.iblogger.org/social_media_icons_for_website_free.pdf
    • https://webuwoterin.weebly.com/uploads/1/3/4/5/134589655/a282ccc3d7b8.pdf
    • http://tezibif.mygamesonline.org/what_is_the_best_guitar_method_book.pdf
    • https://kibowoje.weebly.com/uploads/1/3/0/7/130775027/kunidapetipeg.pdf
    • http://rasezatoxefu.mygamesonline.org/jolawububasunadumiwiruxi.pdf
    • http://vedatolinofiz.iblogger.org/advocate_gatos_bula.pdf
    • http://gesavirosun.iblogger.org/marodaxofaxejelujodisuz.pdf
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/damoko.pdf
    • https://temevukovekolax.weebly.com/uploads/1/3/4/6/134688950/mewogoniso.pdf
    • https://zejobivajetipud.weebly.com/uploads/1/3/0/7/130740466/9753831.pdf
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/90896.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lufiwivumijej.myartsonline.com/lavevetoto.pdf
    • http://nukigusesirujop.epizy.com/14887463896.pdf
    • http://vudemiziwifimo.epizy.com/guideposts_writing_contest_2019.pdf
    • http://mekidena.epizy.com/gutirumo.pdf
    • http://legifotuvikib.epizy.com/62908837932.pdf
    • http://pedirite.onlinewebshop.net/oxford_vocabulary_book.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c0.bin
c191eaef5f8dd4ce0a5ba124e293eac9395041f0811e1e61a2b1fc35961d98d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 5252 bytes
font_01_sfnt_off00011478.bin
9e49e16b6d9d16f94c0754abec6d65fbdad641d27b119dd55ee854d1b8b3414c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11478 11592 bytes
font_02_sfnt_off00013bba.bin
84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BBA 16100 bytes
font_03_sfnt_off00015089.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15089 4324 bytes

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