Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa25d6518d6a6e05…

MALICIOUS

PDF

80.2 KB Created: 2021-02-28 02:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be550c090281d99bf7b0ab4b2c94f38c SHA-1: 738f2495eb61748ec0bdbbcc10327614b5724567 SHA-256: aa25d6518d6a6e05b0cc44bbaa91252184c91c02c191db57ea9c295a4fc56914
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDFs, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily corrupted, appears to reference search terms like 'the crown season 2 episode 1 youtube', indicating a lure to attract users. The ML classifier strongly flagged this PDF as malicious, and the presence of many external URIs supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://nipisod.ru/award?keyword=the+crown+season+2+episode+1+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426687/normal_602a4ac9aad37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476947/normal_601f457f6dc6e.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/zuboxiruru-moniditiwa-jigikoneko.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/1126485.pdfIn PDF document text
    • https://naruvoraxosu.weebly.com/uploads/1/3/0/8/130873998/nabep_kugakap.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/5459811.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/6753466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384145/normal_6002ae6a8382e.pdfIn PDF document text
    • https://zodixezujiz.weebly.com/uploads/1/3/5/3/135345824/5741087.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485309/normal_6003309a74080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fdd7e01cb093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461204/normal_5fcc41e548f74.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/ryobi_2hp_plunge_router_reviews.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/6658720.pdfIn PDF document text
    • https://puwegamojone.weebly.com/uploads/1/3/4/7/134702565/ad7be0.pdfIn PDF document text
    • https://puvixote.weebly.com/uploads/1/3/5/4/135400279/kifadagegif_xetadazarivux_ripitabawezorap_xalafuwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/rakuxoz.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 5596 bytes
SHA-256: 66779c90d950d2bfabe4221b3fa81875a7849d89446f1f607fd7281c1207b156
font_01_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 10448 bytes
SHA-256: ba50a5df5ecf441d59ca25873b6cfc3fb3d51cefad9d6edfe1010da67933d31c

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