Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca7b4b0fcec6b71…

MALICIOUS

PDF

40.9 KB Created: 2020-06-01 21:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a99a7490c74382d661dd76eb775e2aab SHA-1: b7ecf4f456736c07d458f7f8f6c1019cead6743b SHA-256: 0ca7b4b0fcec6b71c1b332c9c5017dcd8a2877e8b9b92fd0db95d8d564e50428
136 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, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, suggesting a link farm or a method to distribute further malicious content or phishing pages. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://intimateinterventions.com/uploads/1/3/0/2/130288775/130288775.html#yapay+zeka+ders+notu
    • http://joanne-jackson.com/uploads/1/3/1/0/131071114/9495896.pdf
    • http://seaviewpainting.com.au/uploads/1/3/1/4/131437628/1057317.pdf
    • http://redgoddessboutique.com/uploads/1/3/0/5/130588924/fexepemoroxa.pdf
    • http://74-123-78-23.mgwnet.com/uploads/1/3/1/1/131164372/a3116cf33282908.pdf
    • http://integrativemedicineman.com/uploads/1/3/0/5/130589305/37e36ea7800.pdf
    • http://mail.englishforprofessionals.biz/uploads/1/3/0/6/130604394/nixori.pdf
    • http://richmondlockandkeystatenisland.com/uploads/1/3/0/5/130551692/4588441.pdf
    • http://intimateinterventions.com/uploads/1/3/0/2/130288775/terms.html
    • http://intimateinterventions.com/uploads/1/3/0/2/130288775/dmca.html
    • http://intimateinterventions.com/uploads/1/3/0/2/130288775/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gazipanobiso.files.wordpress.com/2020/05/13660842518.pdf
    • https://bikixaxapu55491205.files.wordpress.com/2020/05/45162787605.pdf
    • https://kogovabazoro.files.wordpress.com/2020/05/10968315922.pdf
    • https://gubibegal.files.wordpress.com/2020/05/bifetunabo.pdf
    • https://bunexuvujavo230168055.files.wordpress.com/2020/06/sagekugelep.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ded.bin
c1ea99d8a770a35cddea504554e944a62676f005ade38ca86b0b138405f23c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DED 4176 bytes
font_01_sfnt_off00006d79.bin
7d709edd8c3eb5cbdfe410e636e1e2f5512bf88425f18461cfb89a3b755a791e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D79 13404 bytes

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