Malicious PDF — malware analysis report

Static analysis result for SHA-256 613b810e313e2fa7…

MALICIOUS

PDF

35.9 KB Created: 2020-03-16 06:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5faac6417bb8db65490055e75482e42a SHA-1: 3156b74fe5730c44dc0c6a3462c5f3ae4bcb8ea7 SHA-256: 613b810e313e2fa7fe3e72a227c6eee2bd9c8f3528f71ce51f0f14229b78860d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO spamming operation. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be redirecting users to a multitude of other PDF files hosted across different websites.

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://x0065289xstreamtravel.xsideas.com/uploads/1/3/0/6/130604303/130604303.html#cours+d%27+orthographe+ce1+pdf
    • http://betawilloughby.com/uploads/1/3/0/2/130270745/kalevurabix-tadameliloz-lorem.pdf
    • http://messagesfromthedivine.org/uploads/1/3/0/6/130639027/navasubi.pdf
    • http://cpanel.thesefeetwilltravel.com/uploads/1/3/0/5/130539188/mitamow_lodofuluviduwos.pdf
    • http://babyfreebies2020.com/uploads/1/3/0/7/130775922/kegavomiwitiv-nitevipuxil.pdf
    • http://discourse-x.com/uploads/1/3/0/5/130588944/bawowase.pdf
    • http://transportmediamarketing.com/uploads/1/3/0/7/130739196/3579209.pdf
    • http://cpanel.ypflyinggroup.com/uploads/1/3/0/8/130813769/wexuva_sutadiduxe_kofimamutedom_nimobagudi.pdf
    • http://www.jamieserina.com/uploads/1/3/0/6/130639950/994cf82697f.pdf
    • http://hostmaster.nibbanawellness.com/uploads/1/3/0/2/130288426/4d3d0d2f.pdf
    • http://emeralddevelopmentinc.com/uploads/1/3/0/3/130324065/vifonasufuvogu-maranojif-vazafosato-tivafowo.pdf
    • http://visionsoutheast.mobi/uploads/1/3/0/5/130588279/7960789.pdf
    • http://www.lindaleibfarth.com/uploads/1/3/0/8/130813982/8c192.pdf
    • http://www.pc-helpme.com/uploads/1/3/0/9/130969604/jusefogofelan.pdf
    • http://remote.cothrons.com/uploads/1/3/0/5/130588581/0ecb0d0640.pdf
    • http://naufalsamudra.com/uploads/1/3/0/7/130775144/firejonumux.pdf
    • http://www.solidsclothingstore.ca/uploads/1/3/0/6/130620853/xezira-xegixokesuwex-fipizuwepoz.pdf
    • http://pkflash.org/uploads/1/3/0/5/130550955/lanuwitij.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062b0.bin
217219d0ea7094873da161eb701a4a2b532e448216d03aace61c5b56448a7f26
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B0 8144 bytes