Malicious PDF — malware analysis report

Static analysis result for SHA-256 94dd1bf8b458fafb…

MALICIOUS

PDF

74.7 KB Created: 2021-03-31 11:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bbf917d8ce745e5cb3fd135b0211a16 SHA-1: 8d20ff9934200404253bfc0e5c73622d72400fa9 SHA-256: 94dd1bf8b458fafbf51d39962366dddf80bd2ec34c896416ce1a9e320f2481a3
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF SEO link farm. The primary malicious URL observed is https://ponafet.ru/wix?keyword=la+sportiva+python, which likely serves as a gateway to further malicious content or SEO spam. The presence of embedded URLs and the ML classifier's high confidence score indicate a deliberate malicious intent, likely related to distributing spam or malware via SEO techniques.

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://ponafet.ru/wix?keyword=la+sportiva+python
    • http://7lessons.space/nidebisimevogaligelakituyg21w.pdf
    • http://teachost.com/what_are_the_4_basic_principles_of_the_declaration_of_independence57yrf.pdf
    • https://cdn-cms.f-static.net/uploads/4478670/normal_60639e8663ca7.pdf
    • http://segway-wheelchair.ru/683542273943xald.pdf
    • https://cdn-cms.f-static.net/uploads/4409403/normal_60146deedf4b9.pdf
    • http://idealica-official.website/dual_citizenship_usa_uk89r23.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_2e06ca063b9d4584b6a932fb65526a75.pdf?index=true
    • https://s3.amazonaws.com/nilafafakem/6485803795.pdf
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_2f1b36f39c354a54876c8a8f5f903eb0.pdf?index=true
    • https://s3.amazonaws.com/falevi/rujifumafoti.pdf
    • https://s3.amazonaws.com/votuweroxigezog/tizezofamopokibo.pdf
    • https://s3.amazonaws.com/limepusotanal/download_playboi_carti_songs_2019.pdf
    • https://s3.amazonaws.com/libosokune/how_to_operate_masterbuilt_electric_smoker.pdf
    • https://s3.amazonaws.com/woberiz/67957253595.pdf
    • https://s3.amazonaws.com/nuxomigo/aa_4th_step_working_guide.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_off0000e6f8.bin
43cc70a876da6c221e731a67cbcf210e0e45f620c588f13f5526596f67624970
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 4976 bytes
font_01_sfnt_off0000f7ee.bin
b4d379b7052c0883a4aa8ee9bff3ee3d090d6e483b53fa702d3ba12bc8998477
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 10856 bytes