Malicious PDF — malware analysis report

Static analysis result for SHA-256 505afd401df80d3f…

MALICIOUS

PDF

76.8 KB Created: 2021-06-01 09:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff67c2f0f6b7e5fe31d5c4757096dec0 SHA-1: d39acc1d2257cd0c28c84143824bc28b70800365 SHA-256: 505afd401df80d3fc1904882e7c73e52f3eba7d4f3ba677f2be41e6732183acc
96 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 pointing to Weebly and other hosting services, which is indicative of a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content or downloads. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/pbw?utm_term=ugly+duckling+don%2527t+ep+1+eng+sub+download
    • https://jazujopu.weebly.com/uploads/1/3/0/8/130873842/b06d18ca1ff2364.pdf
    • https://cdn-cms.f-static.net/uploads/4420028/normal_601f14aaeefc7.pdf
    • https://patobozojewe.weebly.com/uploads/1/3/4/8/134863794/9858867.pdf
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5fcba6abdc972.pdf
    • https://static.s123-cdn-static.com/uploads/4408713/normal_5feb0f212df97.pdf
    • https://cdn-cms.f-static.net/uploads/4488572/normal_6049ee27534eb.pdf
    • https://cdn-cms.f-static.net/uploads/4479679/normal_5fd740de335d6.pdf
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fca4b80f2a03.pdf
    • https://vojosapixetogal.weebly.com/uploads/1/3/4/7/134770394/lobata-dazuzunozanove-mudipusedijep-vinil.pdf
    • https://kisimerib.weebly.com/uploads/1/3/4/6/134697331/fevori-pobimoninogug-vorozawuwaw.pdf
    • https://noxiwojudom.weebly.com/uploads/1/3/4/7/134723323/4677211.pdf
    • https://cdn-cms.f-static.net/uploads/4385434/normal_6054d32b97c64.pdf
    • https://fuguxowaponiv.weebly.com/uploads/1/3/4/6/134648792/2993885.pdf
    • https://cdn-cms.f-static.net/uploads/4393197/normal_60610a8548524.pdf
    • https://suranekiwexem.weebly.com/uploads/1/3/4/6/134698667/xozidimipiru_texejuwub_luwozaraxiguj.pdf
    • https://panirosarukiza.weebly.com/uploads/1/3/4/1/134132539/xubelibabapuxiz.pdf
    • https://cdn-cms.f-static.net/uploads/4464053/normal_5fe882f2d65dc.pdf
    • https://pirobubav.weebly.com/uploads/1/3/1/3/131380689/wotiw-relonoji.pdf
    • https://tizupokewa.weebly.com/uploads/1/3/4/0/134013062/8654993.pdf
    • https://cdn-cms.f-static.net/uploads/4366014/normal_604023b67a5c0.pdf
    • https://cdn-cms.f-static.net/uploads/4485942/normal_5fd71ff5758c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62c.bin
53441bd4c0336db597b671063eeb3c291de99f004cc445ca61308d4045d57385
pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 5620 bytes
font_01_sfnt_off0000e98f.bin
d99984842b86ec8033be0d7e4ebdf0202a814de9b2db02975037f786aeb2e5b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 9796 bytes
font_02_sfnt_off00010b5f.bin
2699f2ce65472362c7cce2649b9a1ca315f2f35cd4c84f2de76f8c9cc61a5f56
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 17112 bytes