Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21c38c5c96cda41…

MALICIOUS

PDF

78.4 KB Created: 2021-03-29 04:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75fd4ebc548d02d17ffbccaab68e82d0 SHA-1: d9a1d74da650324d5fdebee3a083402f72bd0103 SHA-256: e21c38c5c96cda415ce40af316467749a9a23edea71568ec6362a0dd938b7b33
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing attempt, with one URL specifically mentioning 'add text to pdf free' as a lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external links points towards an attempt to redirect the user to a malicious site.

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://resalured.ru/award?keyword=add+text+to+pdf+free
    • https://static.s123-cdn-static.com/uploads/4381081/normal_5ff53300df503.pdf
    • https://cdn-cms.f-static.net/uploads/4379486/normal_6038e96e6c244.pdf
    • https://static.s123-cdn-static.com/uploads/4453560/normal_5fcc5e4052789.pdf
    • https://static.s123-cdn-static.com/uploads/4410986/normal_5fedf267cf5ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ruvoluze.rf.gd/kuwaxinofalosat.pdf
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_bb249e6c5d1c4815aab2addabce685eb.pdf?index=true
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_cf0e0b083a074415beece1e5172823c6.pdf?index=true
    • http://wanikokod.epizy.com/convert_to_dwg_autocad_2009.pdf
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_95935120bcac46f89c4e7aa8f59d7a7c.pdf?index=true
    • http://kojekudaraj.rf.gd/proving_triangles_congruent_worksheet_kuta.pdf
    • https://s3.amazonaws.com/fizaxo/gesik.pdf
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_d4a3e2dcf79f4f34a577c96a9b5c2657.pdf?index=true
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_4f2e009cb77a4201bcfe769513156237.pdf?index=true
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_7fe97e1df5f84e3788e35bd24b9b9812.pdf?index=true
    • https://s3.amazonaws.com/nisoxow/tecumseh_10hp_snowblower_engine_spark_plug.pdf
    • https://s3.amazonaws.com/jiwisi/aquaman_and_superman_meme_template.pdf
    • http://rivozisotuwiris.rf.gd/62164317756.pdf
    • https://s3.amazonaws.com/lanaladu/zizunofuvu.pdf
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_3d4a5d4fee9a4fb7880b24cf88615596.pdf?index=true
    • http://tukozadagafewan.rf.gd/xokafiduborakemaliwakit.pdf
    • https://s3.amazonaws.com/fajonubinomeder/55603005450.pdf
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_c2b65427e9634eb2940190a996e1901d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e897.bin
8c97366ef305cd7f9c0be78aee9440033824a35e670f32ac86f58bd5c5d967b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 4304 bytes
font_01_sfnt_off0000f745.bin
9c199623a8d1f5297d971680c1d0273cd003004da1f53f4afb5813ee38af777d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 11044 bytes
font_02_sfnt_off00011d1c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1C 4324 bytes

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