Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4cf159baa80e59…

MALICIOUS

PDF

95.4 KB Created: 2021-03-10 22:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94e75f050a4b95b7691c65ee9073a730 SHA-1: 7049972e47c19d76cc49be2c164c146560d1094f SHA-256: bd4cf159baa80e59502411354c1b46b0462029b04ac00c54e85989a86bb72fb5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF files, suggesting a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards a phishing or malware delivery scheme.

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-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://vilenefex.ru/wix?keyword=mechanical+waves+worksheet+answers+mr.+hwang
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/rijokinate.pdf
    • http://gikizevububem.22web.org/ssc_stenographer_syllabus_2020.pdf
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/2242720.pdf
    • http://ranking-se.com/what_is_digital_media_simple_definitionzvlqg.pdf
    • https://somotudodij.weebly.com/uploads/1/3/4/6/134699902/vukamarodigaji-gufonedebonike-jawebunizizizez-surupufire.pdf
    • https://cdn-cms.f-static.net/uploads/4456119/normal_60480c5d99218.pdf
    • http://pumba.fun/exercise_program_in_formal_attire_crossword_cluebze8l.pdf
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5feb28469b3a9.pdf
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5fe24e39077ca.pdf
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/posusazaxo.pdf
    • http://agreevudb.rest/big_ideas_math_algebra_textbook04hy4.pdf
    • https://static.s123-cdn-static.com/uploads/4445736/normal_600219d6de295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bodufusuviv.epizy.com/xibepifanuxipikofo.pdf
    • https://uploads.strikinglycdn.com/files/a86a1967-6b75-41ae-b7cd-0075977fccef/are_cal_spas_any_good.pdf
    • https://uploads.strikinglycdn.com/files/19db14f8-4db7-4979-9761-316f3be6fd2e/watch_fifty_shades_of_grey_full_movie_download_filmywap.pdf
    • https://uploads.strikinglycdn.com/files/6ef85cc7-4e0f-4d9f-b1b3-c583e5112da6/how_to_replace_whirlpool_front_load_washer_door_seal.pdf
    • https://uploads.strikinglycdn.com/files/5a61f216-02e3-4762-86a9-975b21c94f63/evga_gtx_970_ftw_specs.pdf
    • https://uploads.strikinglycdn.com/files/92447f32-2dd0-46be-8a5d-8b7f23b620b8/22205402011.pdf
    • http://sevezogare.rf.gd/99069333476.pdf
    • http://rowagaparik.rf.gd/50030923896.pdf
    • https://uploads.strikinglycdn.com/files/c19c455f-5552-4c35-8474-962e7d46fdf7/27241870375.pdf
    • http://lifinevedilubu.epizy.com/94225956911.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_off0001307b.bin
2636202dd4e6079a267bd4e03294c76f331675be86c073b7510c04dd62abeb98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 5468 bytes
font_01_sfnt_off00014313.bin
8bb66876c8e1d2e8c83d5add21e96af09a46f1bd024ccd00aa454c7a0bc900f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14313 14268 bytes

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