Malicious PDF — malware analysis report

Static analysis result for SHA-256 153edd76640848de…

MALICIOUS

PDF

44.3 KB Created: 2020-03-22 03:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 555b9bac7c4a25fb277125d52b3f92d7 SHA-1: 762f5efec2fcb2586add88e7037187414798ce5b SHA-256: 153edd76640848dec3676614568fea86baf3d67c302bd2873abb860482eb957f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links, likely intended to direct users to malicious content or phishing sites. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://westkendall.org/uploads/1/3/0/2/130272396/130272396.html#build+an+empire+elena+cardone+book+pdf
    • http://hostmaster.newarktownhallmuseum.co.uk/uploads/1/3/0/7/130775104/vomun_zupari_pakutob_sokimatojareri.pdf
    • http://sandybailes.com/uploads/1/3/0/2/130287847/vonataviri-nexave.pdf
    • http://doverashop.com/uploads/1/3/0/6/130620704/waserubepesibu-vusevasiv-romilimebuxow.pdf
    • http://laralaneaz.com/uploads/1/3/0/6/130603740/32b8d9c5.pdf
    • http://cpanel.aptwy.com/uploads/1/3/0/6/130621523/lasepipe.pdf
    • http://autodiscover.tlswindsled.com/uploads/1/3/0/3/130313103/7889323.pdf
    • http://dailyboatdeals.com/uploads/1/3/0/4/130490115/gububisogegovupi.pdf
    • http://segwayitaliatours.com/uploads/1/3/0/5/130538836/dujulekuravelonome.pdf
    • http://ikaregi.org/uploads/1/3/0/7/130776420/76c2a64b419.pdf
    • http://bimandcadlearning.com/uploads/1/3/0/6/130640090/2072351.pdf
    • http://myburnsfamily.com/uploads/1/3/0/6/130605476/137aa791e077595.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_off000076bd.bin
4185435eff4d29a2f4c55b8666b481d9a98bc78bac2bc1672d93a0dee96ae1f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76BD 9436 bytes
font_01_sfnt_off00009a9e.bin
a1e76a4a33fd00720c09c3f73c1e3f7c07e19629020bd456517facccced73307		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A9E 1872 bytes

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