Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e960427265edde…

MALICIOUS

PDF

34.0 KB Created: 2020-03-30 15:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aa0abc26673fb5fdb507bdb36de673b6 SHA-1: 1aaf8bbc221684c056653d62b91be481b179ce53 SHA-256: 12e960427265eddee1a8de1128569382f66bdc88692670c38551935f72311055
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to external PDF files hosted on various domains, many of which appear to be algorithmically generated. This suggests a link farm or SEO poisoning tactic, likely intended to drive traffic or host malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings support the presence of a link farm.

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://www.equestrianeliteatapplejackfarm.com/uploads/1/3/1/4/131453201/131453201.html#ingenieria+mecanica+dinamica+hibbeler+russell+c+pdf
    • http://assekuranz.pro/uploads/1/3/0/7/130738796/bomozuref_dofot_ludik.pdf
    • http://mail.nanakoclothes.com/uploads/1/3/0/3/130324351/fb6a1b53.pdf
    • http://joinhomesmartnow.com/uploads/1/3/0/4/130476816/retir-menezodenaxu-zixemorilinetaw-wixogixax.pdf
    • http://rickmyatt.com/uploads/1/3/1/3/131383434/lijigaxesevonobivar.pdf
    • http://carolwithapickaxe.com/uploads/1/3/0/5/130588780/rixuzinonibutugulito.pdf
    • http://chestertownnazarene.org/uploads/1/3/1/3/131383480/4146602.pdf
    • http://thebrandonkeiffershow.net/uploads/1/3/0/5/130551704/juvujem.pdf
    • http://thesaddlersapprentice.com/uploads/1/3/0/4/130477839/2485860.pdf
    • http://sportvacancies.com/uploads/1/3/0/7/130740177/8a6cfecd2761f.pdf
    • http://betterburner.com/uploads/1/3/0/7/130775461/goxudop.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_off00005d35.bin
34de2d1e6c5c4b5f8b3805b061c1227d92874e5c21964c0c1878594f25afe563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D35 7384 bytes

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