Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1a448e010dfd52…

MALICIOUS

PDF

39.1 KB Created: 2020-06-03 21:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c1ba4afa38d85dcd821a6c67556ac1 SHA-1: 9042d91486f982051e2543b6b49a74eca2635a4c SHA-256: 3d1a448e010dfd52b948fb4046a6066756073cae04f6cc1a7ceb5fc9a6461dbf
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, includes a URL that points to a collection of PDF files hosted on various domains. This suggests a link farm or a distribution mechanism for further malicious content, rather than a legitimate document. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://hdhairpro.com/uploads/1/3/1/6/131637951/131637951.html#why+does+dove+make+chocolate+and+soap
    • http://entrepreneur-mentor.com/uploads/1/3/0/4/130435985/vuxojo_litujeduduwuban.pdf
    • http://natalieunisexandbarbershop.com/uploads/1/3/0/7/130776485/watob.pdf
    • http://tndtravelpartners.voyagerwebsites.com/uploads/1/3/1/1/131163635/wizofowe.pdf
    • http://popsup.org/uploads/1/3/0/5/130589036/86f10.pdf
    • http://bagsofowl.com/uploads/1/3/0/4/130488304/lozibirixajuvavofi.pdf
    • http://corridadadefesanacional.com/uploads/1/3/0/8/130813357/1455081.pdf
    • http://falkirkinvestmentgroup.com/uploads/1/3/1/4/131453588/wutonu.pdf
    • http://claudionalerio.com/uploads/1/3/0/6/130639551/gegire.pdf
    • http://hostmaster.isamurats.co.uk/uploads/1/3/0/5/130543272/714483e.pdf
    • http://texastwistfastpitch.com/uploads/1/3/0/8/130874369/kabujideri.pdf
    • http://hdhairpro.com/uploads/1/3/1/6/131637951/terms.html
    • http://hdhairpro.com/uploads/1/3/1/6/131637951/dmca.html
    • http://hdhairpro.com/uploads/1/3/1/6/131637951/policy.html
    • https://kuzelelete.files.wordpress.com/2020/05/vijufaxitokotu.pdf
    • https://dawileva.files.wordpress.com/2020/06/69807582311.pdf
    • https://tanonikide.files.wordpress.com/2020/06/83214705984.pdf
    • https://fepopunew.files.wordpress.com/2020/06/silisosereku.pdf
    • https://regaxunizi.files.wordpress.com/2020/05/petutewoniseviwoni.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060aa.bin
68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 2900 bytes
font_01_sfnt_off00006ae8.bin
371356ced939ac4696a6b4e6b0c4fe5debf34b23d582ebb1d25e663aba2e769d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE8 10912 bytes