Malicious PDF — malware analysis report

Static analysis result for SHA-256 487795ca6c20dcb3…

MALICIOUS

PDF

71.5 KB Created: 2021-03-15 11:15:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14096037f1a23ee3c9c755bad1de77f5 SHA-1: 53a7c08decf48fba145b304ff22af48347a59ca9 SHA-256: 487795ca6c20dcb369d42a2b37b99bfb33c291a3824279256c135cb6c8577ded
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a suspicious URL to 'pelibifir.ru', suggesting a link farm or phishing attempt. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=german+english+dictionary+of+idioms+pdf
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/dadofofe.pdf
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/meseneraz_paxobamereki.pdf
    • https://cdn.sqhk.co/xeduwukaxusa/fmifjiC/mobile_number_location_phone_call_locator_apk_download.pdf
    • https://cdn.sqhk.co/kajipazuto/bhjuhbH/e_bike_conversion_kit_for_sale.pdf
    • http://balegetiwep.mywebcommunity.org/pekisararazodakoza.pdf
    • https://cdn.sqhk.co/wubunepan/NOvjfje/capsule_nyc_clothing.pdf
    • https://cdn.sqhk.co/dagorabowixu/bhhGyje/third_grade_learning_games_apk.pdf
    • http://meetly.space/6757757717926g8o.pdf
    • http://geekcods.com/romenobeludalajek6wkcn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_fd43948143cb4f07895a303b84c1b69f.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_567c29c51e034bfc9b586cde0b6fe226.pdf?index=true
    • https://s3.amazonaws.com/tobobowu/arena_sport_1_serbia_tv_guide.pdf
    • https://s3.amazonaws.com/fevobelijogal/horde_leveling_guide_wotlk_warmane.pdf
    • http://kubomefewofumim.atwebpages.com/rpf_math_questions_and_answers.pdf
    • https://s3.amazonaws.com/zafirawit/crystal_report_13._0._15.pdf
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_52e1386d8b77401f97d7c327b4b3fdfd.pdf?index=true
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_1327b31ee4964ee7bba77963be4fde12.pdf?index=true
    • https://s3.amazonaws.com/mudurixo/88310490055.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/99972201307.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d84a.bin
ccbf20dbbcb6802746d17cbc8302fbded32f4bc619cda7ee0bf97961d58658cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 5704 bytes
font_01_sfnt_off0000eb8c.bin
157d63a88c5f4d20084d86903368468864553eebbf027ef0b106107f4cb2fe58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8C 11016 bytes

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