Malicious PDF — malware analysis report

Static analysis result for SHA-256 71de13eb4e98ace6…

MALICIOUS

PDF

101.4 KB Created: 2020-06-07 04:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2679be22a5e2d2234f4bccd8fa18329 SHA-1: 181f0a8c83eaf22b0eb0cc442708879aec73050d SHA-256: 71de13eb4e98ace60d71e72e64b1e570828b6db059cba79ba4b3a00f5502865e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm designed to distribute malicious content. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the presence of numerous external URLs indicates a likely attempt to redirect users to malicious sites, potentially for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 http://zuanshixianshangyule.br3h.com/uploads/1/3/0/5/130539131/130539131.html#%25D9%2585%25D8%25A7+%25D8%25AD%25D8%25AF%25D8%25AB+%25D8%25A8%25D9%258A%25D9%2586+%2528%25D9%2586%25D9%258A%25D9%2583+%25D9%2583%25D8%25A7%25D9%2586%25D9%2588%25D9%2586%2529+%25D9%2588+%2528%25D8%25A5%25D9%2585%25D9%258A%25D9%2586%25D9%258A%25D9%2585%2529
    • http://ballersstrength.com/uploads/1/3/1/4/131408100/5ae582774616a.pdf
    • http://fairbankplanb.org/uploads/1/3/1/4/131437976/tetobawelatirizefita.pdf
    • http://handymanofgreenhills.com/uploads/1/3/0/7/130775001/pubodugeled.pdf
    • http://abatsportsinjuryclinic.com/uploads/1/3/1/3/131380383/313d48d1c9970ed.pdf
    • http://cathylibnic.com/uploads/1/3/0/6/130622089/3627347.pdf
    • http://doubleheartsoapcompany.com/uploads/1/3/0/4/130488365/e5a8837.pdf
    • http://imagesbyannmarie.com/uploads/1/3/1/3/131398148/zovazixofa.pdf
    • http://gaskanshi.com/uploads/1/3/1/4/131453076/b2daffc104c57.pdf
    • http://bayanillc.com/uploads/1/3/0/7/130775737/guzafuwaba.pdf
    • http://gogoutilities.com/uploads/1/3/0/5/130589281/1336890.pdf
    • http://falsepeaknews.com/uploads/1/3/1/3/131379532/d623945dfc2895.pdf
    • http://bigdipbirding.com/uploads/1/3/0/5/130588278/f21c6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://saxevana.files.wordpress.com/2020/06/rawetuvamofadijijikazu.pdf
    • https://nibixodowoxo171687391.files.wordpress.com/2020/06/22706754394.pdf
    • https://gapifub.files.wordpress.com/2020/06/51425944723.pdf
    • https://kijutozev.files.wordpress.com/2020/06/28081508188.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012bdf.bin
0d6db253d243824ee087775316727e5e4a3a91e046d5b6e06dd4f46272045694		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BDF 33420 bytes
font_01_sfnt_off000164f1.bin
d230d5267ace84494cb377faa79dc0ac6a7370acb2fd3b308ff195cf6ff16a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164F1 9848 bytes

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