Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95f8c7bd353682f…

MALICIOUS

PDF

33.1 KB Created: 2020-06-07 08:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 9a74c21872d9b4389dd57a71c537f314 SHA-1: bceec1025a3c009f47e50fa1af5011d38af5357b SHA-256: f95f8c7bd353682f0e5072d9b284d4a8d47635aa49c6ffc731bf668bcc3bc812
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for undesirable sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a malicious campaign.

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://pomp5.pleasingfood.com/uploads/1/3/0/4/130490006/130490006.html#disawar+satta+king+ki+report PDF link annotation
    • http://shrinksync.com/uploads/1/3/0/6/130639995/fc3ee.pdfIn PDF document text
    • http://platiumfuncasinohire.com.au/uploads/1/3/1/3/131384536/vajenirotipejaz_fitirafenu.pdfIn PDF document text
    • http://seapowermanagement.com/uploads/1/3/1/4/131453402/4017328.pdfIn PDF document text
    • http://casemedicine.org/uploads/1/3/0/2/130273804/petiwezutaz.pdfIn PDF document text
    • http://mail.rmrrsha.com/uploads/1/3/1/3/131381682/4196712.pdfIn PDF document text
    • http://mta-sts.swiftswcd.org/uploads/1/3/0/5/130538994/1860012.pdfIn PDF document text
    • http://11f.undesirable.us/uploads/1/3/0/2/130289719/6749663.pdfIn PDF document text
    • http://kupponen.com/uploads/1/3/0/7/130775242/fotozagodalob_tamozavazov_xaputibumimixon.pdfIn PDF document text
    • http://anna-grace-photo.com/uploads/1/3/1/3/131379732/8784096.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nubiwudowuva456071019.files.wordpress.com/2020/06/33594111993.pdfIn PDF document text
    • https://wotolijexux.files.wordpress.com/2020/06/15985767435.pdfIn PDF document text
    • https://wifuxew.files.wordpress.com/2020/06/77143146618.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57FC 9740 bytes
SHA-256: 90ac22abe53dff3d9a2cff8b6e522e3b7cbdc9d184c6d1ca02e2be8c1f627213