Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e93cc7765bc05fc…

MALICIOUS

PDF

75.6 KB Created: 2021-06-07 22:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb05c83f99ce2275405382bd4ff9a928 SHA-1: 94ae0afab1f02b82cc020302fd7db3092ba7164b SHA-256: 7e93cc7765bc05fc5d827e7766a69331353873783959be4e6dcf12c5be1eda3a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly and other file-sharing services, suggesting a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/pbw?utm_term=sobotta+anatomi+atlas%25C4%25B1+pdf+indir+t%25C3%25BCrk%25C3%25A7e
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/5289054.pdf
    • https://busuguzokiw.weebly.com/uploads/1/3/1/4/131406797/8200479.pdf
    • https://reserekeluzor.weebly.com/uploads/1/3/4/7/134721257/lafesotaxo.pdf
    • https://linusakeziri.weebly.com/uploads/1/3/4/7/134747074/8208695.pdf
    • https://kenozojuxezo.weebly.com/uploads/1/3/2/6/132695381/20c750284271.pdf
    • https://raxuvupu.weebly.com/uploads/1/3/4/7/134707125/7355547.pdf
    • https://toguvanamevodo.weebly.com/uploads/1/3/4/6/134615804/mukun.pdf
    • https://gatimosuxanad.weebly.com/uploads/1/3/2/8/132814295/8572251.pdf
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/busomobufelibatomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/db8c1394-2f9d-4f41-bf29-744578a30896/81619591825.pdf
    • http://vakerul.pbworks.com/w/file/fetch/144504141/66226749324.pdf
    • http://gatasulupu.pbworks.com/f/60775476912.pdf
    • https://uploads.strikinglycdn.com/files/abf5fcb2-0840-481c-8371-2fc5e81dcfec/buzoliporokimos.pdf
    • https://uploads.strikinglycdn.com/files/85287543-90de-4cf8-ac5c-78b2f4bd6f33/ge_dryer_timer_knob_212d1726.pdf
    • http://volikedejefa.pbworks.com/f/libro_de_nanda_nic_noc.pdf
    • https://uploads.strikinglycdn.com/files/657413f2-dc02-4586-856f-e85b468edea6/ketinisebilediribazokudi.pdf
    • https://uploads.strikinglycdn.com/files/e8740ec1-97cb-468e-8877-76aaa5d43cf2/captain_sim_757_united_livery.pdf
    • http://xofitesu.pbworks.com/w/file/fetch/144439722/free_fire_max_apk_descargar_2020_para_pc.pdf
    • http://papoxuva.pbworks.com/f/nivubis.pdf
    • https://uploads.strikinglycdn.com/files/e4943222-ead8-4475-820f-14c5d9cd4f6b/behind_closed_doors_book_review.pdf
    • http://zelovoguvunu.pbworks.com/w/file/fetch/144427119/butuxepube.pdf
    • http://josinibugaju.pbworks.com/f/41919071353.pdf
    • http://fezosubi.pbworks.com/w/file/fetch/144782562/99562222768.pdf
    • https://uploads.strikinglycdn.com/files/021ddeb7-770f-4800-8bc2-7cb76d861c2e/kaxabekunabu.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_off0000e429.bin
ae474e3a3bae12e49b0326faaeeecbae9ea0e32160e8c6f1d21a31cea66e8ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 5828 bytes
font_01_sfnt_off0000f7b5.bin
9e761e3d5670fdf85a132083895808a6b1230c790d2c9e9f46092f9d8aa10e47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 12480 bytes

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