Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c61db3d65018a1…

MALICIOUS

PDF

97.3 KB Created: 2021-03-29 19:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b497d963e783f88afa6377faba487906 SHA-1: b8e5134cfc07d337c34b0af3c5e30e9adc81f49c SHA-256: 63c61db3d65018a1f95cef5f652fbf5cd24287c5d2bec672a8dfc0f2c728a09f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/award?keyword=manual+de+autocad+2020+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5ff965c6a35da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fe7a28f490c1.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/dbd20cb3b57c8d7.pdfIn PDF document text
    • http://insta-sale.site/wesovidumexamawevos98pgd.pdfIn PDF document text
    • http://circleshtang.xyz/bojeresadadapitidepotulespfk6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_601bfcaa33995.pdfIn PDF document text
    • https://gariligiradafa.weebly.com/uploads/1/3/4/0/134041078/5904113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401691/normal_5fc655c18621d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_6057cd3e03d3d.pdfIn PDF document text
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/8562238.pdfIn PDF document text
    • https://nogegonimever.weebly.com/uploads/1/3/4/3/134340032/33ee70edc6cb8.pdfIn PDF document text
    • https://gujejedadun.weebly.com/uploads/1/3/1/3/131398181/dijij-gubetufemopi-diwijasug-zaxevuwumita.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470389/normal_60068636991d3.pdfIn PDF document text
    • http://ledy66.net/how_to_download_kindle_books_for_freebr55l.pdfIn PDF document text
    • https://guzuwifaxad.weebly.com/uploads/1/3/4/0/134096987/jimetodoti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5fd091121481b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_5fd62800ae278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_6013b8bd070ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_5fe7255523ae4.pdfIn PDF document text
    • https://jukatuve.weebly.com/uploads/1/3/2/7/132741058/jezaxudodapapuge.pdfIn PDF document text
    • https://revowerixes.weebly.com/uploads/1/3/1/6/131607662/reseralejebajur_dukofev_rufudofilagivab_dimupobesonow.pdfIn PDF document text
    • http://d2-club.ru/maytag_bravos_quiet_series_300_dryer_partslj2a0.pdfIn PDF document text
    • http://rusakova.space/606380509212aa0i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_1a1b177f089a4b1b9d5a9998186a0b3d.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_dddf1f6d7d0b4967ae484c0d738a8a52.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD0 5600 bytes
SHA-256: 51cf4e89ff26f84de2cef50117c682ae8058c3a4f3222bd5ee881b579557d5ce
font_01_sfnt_off00013ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF9 2212 bytes
SHA-256: 0cc23cfa0f44683c72452f3667f5430ee4354a03421c195b06919083f93a5ba6
font_02_sfnt_off000148a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A2 13788 bytes
SHA-256: 5a81900b8ddb4891548e0647d774e8cfdca5b09bb240d23d397ee62f086efb12