Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58335cbcf8118a3…

MALICIOUS

PDF

144.4 KB Created: 2021-03-14 20:22:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e8de394783601b1ccc5c6986851b3388 SHA-1: 3e2083de64a076587d713b66b7b75f9b71304244 SHA-256: f58335cbcf8118a31e29b1db15e5dd39e35e128acd664c70d65c0de9813e353f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or a phishing campaign. The primary URL, https://ponafet.ru/123, is likely used to redirect users to malicious content or to gather information. No scripts were extracted, but the presence of numerous external links points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ponafet.ru/123?utm_term=hebrew+alphabet+chart+pdf PDF link annotation
    • http://idealica-ordina.site/zurobufovt6hr2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493597/normal_5ffa931d7b0a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fd3b0a89ad6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394068/normal_600cce1438109.pdfIn PDF document text
    • http://milanomoda-italy.site/ctet_syllabus_paper_1_20190azd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fd271e5e9d10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5ff334187e08f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365659/normal_5fc64be88fa1f.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/farowug/57426359799.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_efe8ed196e8f482da874cd0b83d4daff.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_04535c55ce1d414aa471e513220c0ca6.pdf?index=trueIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_e911415512c546ed94ab569db518526c.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_faf6a54fdf6d44eeaa16811c16846dab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towakog/zadewurenov.pdfIn PDF document text
    • https://c1ab63b4-4781-4901-abeb-f581ed41d26f.filesusr.com/ugd/b44917_a591a7ab76574d809d1f1a618b18cdb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizabo/59261734398.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/less_than_zero_streaming_sub_eng.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/18867417840.pdfIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_3a818e72853841e1b81001c4b3edb7e2.pdf?index=trueIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_583da8d93af9420e98a5f37e0f254423.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_f43774022d4343e38638954ae9cae33a.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001f1ef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F1EF 22720 bytes
SHA-256: 321eff4b2b241c4b6f478a93ba74a90a9e7cba20aa7588975493039cec086ad2
font_00_sfnt_off0001948d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1948D 5260 bytes
SHA-256: 47e14d11c67f02ac173d7e53333387c141e320748cba4d871131badbed8cedbf
font_01_sfnt_off0001a675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A675 27512 bytes
SHA-256: 0ccd4318cf0e5aa64d63fbaaeb2bd26f02bee9f492f1545ecf5d304e13795b5f
font_03_sfnt_off000218d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x218D3 9160 bytes
SHA-256: 22302d08d65d85b40cee3417c90e33024ef5a72ebe150cb37fc8a964a3f0e22a